Lineárne rovnice s jednou neznámou sú ako matematické hádanky, kde... Show more
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Lineárne rovnice: Jednoduché riešenie krok za krokom
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Úvod do lineárnych rovníc
Predstav si lineárnu rovnicu ako váhy v rovnováhe - čo urobíš na jednej strane, musíš urobiť aj na druhej. Rovnica je matematický zápis, ktorý hovorí, že dve veci sa rovnajú, a vždy má znak rovnosti =.
Neznáma (označuje sa najčastejšie písmenom x) je to číslo, ktoré hľadáme. Koreň rovnice je správna odpoveď - tá hodnota, ktorú keď dosadíme namiesto x, rovnica "sedí".
Lineárna rovnica má neznámu vždy v prvej mocnine. To znamená, že tam nie sú žiadne x², x³ ani √x - iba obyčajné x. Príklad: 2x + 3 = 7.
💡 Tip: Vždy si predstav rovnicu ako váhy - čo urobíš na jednej strane, urob aj na druhej!
Ekvivalentné úpravy a postup riešenia
Ekvivalentné úpravy sú tvoje nástroje na riešenie rovníc. Môžeš pripočítať, odpočítať, vynásobiť alebo vydeliť obe strany rovnice rovnakým číslom, a riešenie sa nezmení.
Tvoj cieľ je jasný: dostať x samotné na jednu stranu a číslo na druhú. Postupuješ v tomto poradí: najprv odstráň zátvorky roznásobením, potom sa zbav zlomkov vynásobením celej rovnice spoločným menovateľom.
Ďalej presuň všetky členy s x na jednu stranu a čísla na druhú. Pozor na znamienka - keď prenášaš člen cez rovnítko, zmeň mu znamienko na opačné!
Na záver zjednoduš obe strany a vydeľ koeficientom pri x. Nikdy nezabudni na skúšku - dosať svoje riešenie do pôvodnej rovnice a over, či ľavá strana = pravá strana.
💡 Pozor: Zmena znamienka pri prenášaní členov je najčastejšia chyba!
Riešené príklady - základné typy
Tu si ukážeme, ako riešiť rovnicu 5x - 8 = 2x + 7. Najprv presuň 2x doľava : 5x - 2x - 8 = 7. Potom presuň -8 doprava : 5x - 2x = 7 + 8.
Zjednoduš: 3x = 15. Vydeľ trojkou: x = 5.
Skúška: Dosadíš x = 5 do pôvodnej rovnice. Ľavá strana: 5×5 - 8 = 17. Pravá strana: 2×5 + 7 = 17. Keďže 17 = 17, riešenie je správne!
Pri rovniciach so zátvorkami ako 3+5 = 2 najprv roznásob: 3y - 6 + 5 = 2y + 2. Potom pokračuj štandardne.
💡 Dôležité: Skúška nie je len formalita - je to tvoja poistka proti chybám!
Rovnice so zátvorkami a zlomkami
Keď vidíš zátvorky, roznásob ich hneď na začiatku. Pri 3+5 = 2 to znamená: 3y - 6 + 5 = 2y + 2. Každý člen pred zátvorkou násobíš každým členom vnútri.
Zjednoduš číselné členy: 3y - 1 = 2y + 2. Potom postupuj štandardne - presuň y na ľavú stranu a čísla doprava.
Zlomky sa zbavíš na začiatku. Pri rovnici x/3 - 1/2 = x/6 + 1 nájdi najmenší spoločný násobok menovateľov (tu je to 6). Celú rovnicu vynásob číslom 6.
Po vynásobení dostaneš: 2x - 3 = x + 6. Teraz môžeš pokračovať normálne bez zlomkov.
💡 Tip: Zlomky sa zbav hneď na začiatku - ušetríš si veľa času a chýb!
Dokončenie príkladu so zlomkami
Po vynásobení rovnice x/3 - 1/2 = x/6 + 1 číslom 6 máš: 2x - 3 = x + 6. Presuň x z pravej strany doľava: 2x - x - 3 = 6.
Presuň -3 doprava: 2x - x = 6 + 3. Zjednoduš: x = 9.
Skúška je kľúčová: Dosadíš x = 9 do pôvodnej rovnice. Ľavá strana: 9/3 - 1/2 = 3 - 1/2 = 5/2. Pravá strana: 9/6 + 1 = 3/2 + 1 = 5/2.
Keďže obe strany sú 5/2, riešenie x = 9 je správne. Vidíš, ako dôležitá je skúška? Bez nej si nikdy nemôžeš byť istý.
💡 Zapamätaj si: Pri zlomkoch počítaj pomaly a opatrne - chyby sa robia ľahko!
Zhrnutie a kľúčové tipy
Postup riešenia lineárnych rovníc má svoj pevný poriadok: odstráň zátvorky, zbav sa zlomkov, presuň x na jednu stranu a čísla na druhú, zjednoduš a vydeľ koeficientom pri x.
Najčastejšie chyby: Zabudnutie zmeniť znamienko pri prenášaní členov, chyby pri roznásobovaní zátvoriek a vynechanie skúšky. Tieto chyby ťa môžu stáť body na teste!
Ekvivalentné úpravy sú tvoje základné nástroje - pripočítanie, odpočítanie, násobenie a delenie (nenulovým číslom) na oboch stranách rovnice.
Skúška nie je len posledný krok - je to tvoja záruka správnosti. Dosadíš vypočítané riešenie do pôvodnej rovnice a overíš, či ľavá strana = pravá strana.
💡 Na záver: Lineárne rovnice sú ako recept - dodržuj postup a určite to zvládneš!
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Most popular content in Matematika
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Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
Lineárne rovnice: Jednoduché riešenie krok za krokom
Lineárne rovnice s jednou neznámou sú ako matematické hádanky, kde hľadáš jedno konkrétne číslo. Nie sú to len nudné školské príklady - používaš ich v reálnom živote, keď počítaš cenu nákupu alebo čas cesty.
Úvod do lineárnych rovníc
Predstav si lineárnu rovnicu ako váhy v rovnováhe - čo urobíš na jednej strane, musíš urobiť aj na druhej. Rovnica je matematický zápis, ktorý hovorí, že dve veci sa rovnajú, a vždy má znak rovnosti =.
Neznáma (označuje sa najčastejšie písmenom x) je to číslo, ktoré hľadáme. Koreň rovnice je správna odpoveď - tá hodnota, ktorú keď dosadíme namiesto x, rovnica "sedí".
Lineárna rovnica má neznámu vždy v prvej mocnine. To znamená, že tam nie sú žiadne x², x³ ani √x - iba obyčajné x. Príklad: 2x + 3 = 7.
💡 Tip: Vždy si predstav rovnicu ako váhy - čo urobíš na jednej strane, urob aj na druhej!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Ekvivalentné úpravy a postup riešenia
Ekvivalentné úpravy sú tvoje nástroje na riešenie rovníc. Môžeš pripočítať, odpočítať, vynásobiť alebo vydeliť obe strany rovnice rovnakým číslom, a riešenie sa nezmení.
Tvoj cieľ je jasný: dostať x samotné na jednu stranu a číslo na druhú. Postupuješ v tomto poradí: najprv odstráň zátvorky roznásobením, potom sa zbav zlomkov vynásobením celej rovnice spoločným menovateľom.
Ďalej presuň všetky členy s x na jednu stranu a čísla na druhú. Pozor na znamienka - keď prenášaš člen cez rovnítko, zmeň mu znamienko na opačné!
Na záver zjednoduš obe strany a vydeľ koeficientom pri x. Nikdy nezabudni na skúšku - dosať svoje riešenie do pôvodnej rovnice a over, či ľavá strana = pravá strana.
💡 Pozor: Zmena znamienka pri prenášaní členov je najčastejšia chyba!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
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Riešené príklady - základné typy
Tu si ukážeme, ako riešiť rovnicu 5x - 8 = 2x + 7. Najprv presuň 2x doľava : 5x - 2x - 8 = 7. Potom presuň -8 doprava : 5x - 2x = 7 + 8.
Zjednoduš: 3x = 15. Vydeľ trojkou: x = 5.
Skúška: Dosadíš x = 5 do pôvodnej rovnice. Ľavá strana: 5×5 - 8 = 17. Pravá strana: 2×5 + 7 = 17. Keďže 17 = 17, riešenie je správne!
Pri rovniciach so zátvorkami ako 3+5 = 2 najprv roznásob: 3y - 6 + 5 = 2y + 2. Potom pokračuj štandardne.
💡 Dôležité: Skúška nie je len formalita - je to tvoja poistka proti chybám!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Rovnice so zátvorkami a zlomkami
Keď vidíš zátvorky, roznásob ich hneď na začiatku. Pri 3+5 = 2 to znamená: 3y - 6 + 5 = 2y + 2. Každý člen pred zátvorkou násobíš každým členom vnútri.
Zjednoduš číselné členy: 3y - 1 = 2y + 2. Potom postupuj štandardne - presuň y na ľavú stranu a čísla doprava.
Zlomky sa zbavíš na začiatku. Pri rovnici x/3 - 1/2 = x/6 + 1 nájdi najmenší spoločný násobok menovateľov (tu je to 6). Celú rovnicu vynásob číslom 6.
Po vynásobení dostaneš: 2x - 3 = x + 6. Teraz môžeš pokračovať normálne bez zlomkov.
💡 Tip: Zlomky sa zbav hneď na začiatku - ušetríš si veľa času a chýb!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Dokončenie príkladu so zlomkami
Po vynásobení rovnice x/3 - 1/2 = x/6 + 1 číslom 6 máš: 2x - 3 = x + 6. Presuň x z pravej strany doľava: 2x - x - 3 = 6.
Presuň -3 doprava: 2x - x = 6 + 3. Zjednoduš: x = 9.
Skúška je kľúčová: Dosadíš x = 9 do pôvodnej rovnice. Ľavá strana: 9/3 - 1/2 = 3 - 1/2 = 5/2. Pravá strana: 9/6 + 1 = 3/2 + 1 = 5/2.
Keďže obe strany sú 5/2, riešenie x = 9 je správne. Vidíš, ako dôležitá je skúška? Bez nej si nikdy nemôžeš byť istý.
💡 Zapamätaj si: Pri zlomkoch počítaj pomaly a opatrne - chyby sa robia ľahko!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Zhrnutie a kľúčové tipy
Postup riešenia lineárnych rovníc má svoj pevný poriadok: odstráň zátvorky, zbav sa zlomkov, presuň x na jednu stranu a čísla na druhú, zjednoduš a vydeľ koeficientom pri x.
Najčastejšie chyby: Zabudnutie zmeniť znamienko pri prenášaní členov, chyby pri roznásobovaní zátvoriek a vynechanie skúšky. Tieto chyby ťa môžu stáť body na teste!
Ekvivalentné úpravy sú tvoje základné nástroje - pripočítanie, odpočítanie, násobenie a delenie (nenulovým číslom) na oboch stranách rovnice.
Skúška nie je len posledný krok - je to tvoja záruka správnosti. Dosadíš vypočítané riešenie do pôvodnej rovnice a overíš, či ľavá strana = pravá strana.
💡 Na záver: Lineárne rovnice sú ako recept - dodržuj postup a určite to zvládneš!
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user