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Updated Mar 21, 2026
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Druhá a Tretia Odmocnina Jednoducho
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Druhá a tretia odmocnina - základy
Predstav si, že máš štvorec s plochou 25 cm² a chceš vedieť, aká je jeho strana. Presne na toto potrebuješ odmocňovanie.
Druhá odmocnina (značíme √) je číslo, ktoré keď vynásobíš samo sebou, dostaneš pôvodné číslo. Napríklad √25 = 5, lebo 5 × 5 = 25. Tretia odmocnina (značíme ∛) je číslo, ktoré keď vynásobíš samo sebou trikrát, dostaneš pôvodné číslo.
Odmocnenec je číslo pod odmocninou a odmocniteľ je malé číslo nad symbolom (pri druhej odmocnine sa dvojka nepíše). Pri tretej odmocnine musíš trojku napísať vždy.
💡 Tip: Odmocňovanie je presne opačná operácia k umocňovaniu!
Druhá odmocnina - pravidlá a vlastnosti
Druhá odmocnina má jasné pravidlá, ktoré musíš dodržiavať. Odmocňovať môžeš len nezáporné čísla - takže √(-9) nevieš vypočítať. Výsledok je tiež vždy nezáporné číslo.
Najdôležitejšie vlastnosti sú jednoduché: √(a²) = a, √(a·b) = √a · √b, a √ = √a / √b. Tieto vzorce ti pomôžu zjednodušovať zložitejšie príklady.
Naučiť sa naspamäť dokonalé štvorce je super nápad: 1² = 1, 2² = 4, 3² = 9, 4² = 16, 5² = 25, až po 15² = 225. Keď ich budeš vedieť, odmocňovanie bude rýchle a jednoduché.
💡 Pozor: √9 = 3, ale ak riešiš rovnicu x² = 9, tak x môže byť aj -3!
Tretia odmocnina - rozdiely a výhody
Tretia odmocnina je voľnejšia ako druhá. Môžeš odmocňovať aj záporné čísla! Napríklad ∛(-8) = -2, lebo (-2) × (-2) × (-2) = -8.
Vlastnosti sú podobné druhej odmocnine: ∛(a³) = a, ∛(a·b) = ∛a · ∛b, a ∛ = ∛a / ∛b. Dôležité dokonalé kocky sú: 1³ = 1, 2³ = 8, 3³ = 27, 4³ = 64, 5³ = 125.
Hlavné rozdiely: druhá odmocnina len z nezáporných čísel s nezáporným výsledkom, tretia odmocnina z akýchkoľvek čísel s akýmkoľvek výsledkom. Pri zápise druhá odmocnina nepotrebuje dvojku (√), tretia potrebuje trojku (∛).
💡 Finta: Tretia odmocnina zachováva znamienko - zo záporného čísla dostaneš záporný výsledok.
Praktické príklady a aplikácie
Poďme na konkrétne úlohy! Ak má štvorec plochu 144 cm², jeho strana je √144 = 12 cm. Skúšaš postupne: 10² = 100, 11² = 121, 12² = 144 - bingo!
Pre kocku s objemom 125 m³ hľadáš hranu cez ∛125. Postupne: 3³ = 27, 4³ = 64, 5³ = 125. Hrana je 5 m.
Geometrické úlohy sú najčastejšie použitie odmocnín. Plocha štvorca = a², takže strana = √plocha. Objem kocky = a³, takže hrana = ∛objem. Tieto vzťahy používaš neustále.
💡 Stratégia: Pri neznámych hodnotách skúšaj postupne čísla, až kým nenájdeš správny výsledok.
Tipy a častá chyby
Pozor na znamienka! √9 = 3 (vždy len kladný výsledok), ale rovnica x² = 9 má dve riešenia: x = 3 alebo x = -3. Toto je častá chyba na testoch.
Naučiť sa dokonalé štvorce a kocky naspamäť ti ušetrí veľa času. Do 15² a 5³ by si mal vedieť bez váhania. Na kalkulačke si môžeš skontrolovať výsledky, ale na skúške ju možno nebudeš môcť použiť.
Prepájaj s geometriou - odmocniny nie sú abstraktné čísla, ale praktické nástroje. Vždy si predstav štvorec alebo kocku, keď počítaš.
💡 Pamätaj: Odmocnina √ vždy znamená kladný výsledok, nezáleží na tom, čo riešiš!
Rýchly súhrn pre testy
Druhá odmocnina (√): z nezáporných čísel, výsledok nezáporný, dvojka sa nepíše. Tretia odmocnina (∛): z akýchkoľvek čísel, výsledok môže byť akýkoľvek, trojka sa píše vždy.
Kľúčové hodnoty: √1=1, √4=2, √9=3, √16=4, √25=5, √36=6, √49=7, √64=8, √81=9, √100=10. Pre kocky: ∛1=1, ∛8=2, ∛27=3, ∛64=4, ∛125=5.
Praktické použitie: strana štvorca = √plocha, hrana kocky = ∛objem. Odmocňovanie je opak umocňovania a pomáha ti riešiť geometrické úlohy.
💡 Pre test: Ak si zapamätáš dokonalé štvorce a kocky, zvládneš 90% úloh bez problémov!
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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4.7/5
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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
Druhá a Tretia Odmocnina Jednoducho
Odmocňovanie je ako opačná operácia k umocňovaniu - pomáha ti nájsť číslo, ktoré keď umocníš, dostaneš zadané číslo. Potrebuješ to hlavne pri riešení úloh so štvorcom a kockou, keď poznáš plochu alebo objem a chceš zistiť stranu.
Druhá a tretia odmocnina - základy
Predstav si, že máš štvorec s plochou 25 cm² a chceš vedieť, aká je jeho strana. Presne na toto potrebuješ odmocňovanie.
Druhá odmocnina (značíme √) je číslo, ktoré keď vynásobíš samo sebou, dostaneš pôvodné číslo. Napríklad √25 = 5, lebo 5 × 5 = 25. Tretia odmocnina (značíme ∛) je číslo, ktoré keď vynásobíš samo sebou trikrát, dostaneš pôvodné číslo.
Odmocnenec je číslo pod odmocninou a odmocniteľ je malé číslo nad symbolom (pri druhej odmocnine sa dvojka nepíše). Pri tretej odmocnine musíš trojku napísať vždy.
💡 Tip: Odmocňovanie je presne opačná operácia k umocňovaniu!
Sign up to see the contentIt's free!
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Druhá odmocnina - pravidlá a vlastnosti
Druhá odmocnina má jasné pravidlá, ktoré musíš dodržiavať. Odmocňovať môžeš len nezáporné čísla - takže √(-9) nevieš vypočítať. Výsledok je tiež vždy nezáporné číslo.
Najdôležitejšie vlastnosti sú jednoduché: √(a²) = a, √(a·b) = √a · √b, a √ = √a / √b. Tieto vzorce ti pomôžu zjednodušovať zložitejšie príklady.
Naučiť sa naspamäť dokonalé štvorce je super nápad: 1² = 1, 2² = 4, 3² = 9, 4² = 16, 5² = 25, až po 15² = 225. Keď ich budeš vedieť, odmocňovanie bude rýchle a jednoduché.
💡 Pozor: √9 = 3, ale ak riešiš rovnicu x² = 9, tak x môže byť aj -3!
Sign up to see the contentIt's free!
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Tretia odmocnina - rozdiely a výhody
Tretia odmocnina je voľnejšia ako druhá. Môžeš odmocňovať aj záporné čísla! Napríklad ∛(-8) = -2, lebo (-2) × (-2) × (-2) = -8.
Vlastnosti sú podobné druhej odmocnine: ∛(a³) = a, ∛(a·b) = ∛a · ∛b, a ∛ = ∛a / ∛b. Dôležité dokonalé kocky sú: 1³ = 1, 2³ = 8, 3³ = 27, 4³ = 64, 5³ = 125.
Hlavné rozdiely: druhá odmocnina len z nezáporných čísel s nezáporným výsledkom, tretia odmocnina z akýchkoľvek čísel s akýmkoľvek výsledkom. Pri zápise druhá odmocnina nepotrebuje dvojku (√), tretia potrebuje trojku (∛).
💡 Finta: Tretia odmocnina zachováva znamienko - zo záporného čísla dostaneš záporný výsledok.
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Praktické príklady a aplikácie
Poďme na konkrétne úlohy! Ak má štvorec plochu 144 cm², jeho strana je √144 = 12 cm. Skúšaš postupne: 10² = 100, 11² = 121, 12² = 144 - bingo!
Pre kocku s objemom 125 m³ hľadáš hranu cez ∛125. Postupne: 3³ = 27, 4³ = 64, 5³ = 125. Hrana je 5 m.
Geometrické úlohy sú najčastejšie použitie odmocnín. Plocha štvorca = a², takže strana = √plocha. Objem kocky = a³, takže hrana = ∛objem. Tieto vzťahy používaš neustále.
💡 Stratégia: Pri neznámych hodnotách skúšaj postupne čísla, až kým nenájdeš správny výsledok.
Sign up to see the contentIt's free!
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Improve your grades
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Tipy a častá chyby
Pozor na znamienka! √9 = 3 (vždy len kladný výsledok), ale rovnica x² = 9 má dve riešenia: x = 3 alebo x = -3. Toto je častá chyba na testoch.
Naučiť sa dokonalé štvorce a kocky naspamäť ti ušetrí veľa času. Do 15² a 5³ by si mal vedieť bez váhania. Na kalkulačke si môžeš skontrolovať výsledky, ale na skúške ju možno nebudeš môcť použiť.
Prepájaj s geometriou - odmocniny nie sú abstraktné čísla, ale praktické nástroje. Vždy si predstav štvorec alebo kocku, keď počítaš.
💡 Pamätaj: Odmocnina √ vždy znamená kladný výsledok, nezáleží na tom, čo riešiš!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
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Rýchly súhrn pre testy
Druhá odmocnina (√): z nezáporných čísel, výsledok nezáporný, dvojka sa nepíše. Tretia odmocnina (∛): z akýchkoľvek čísel, výsledok môže byť akýkoľvek, trojka sa píše vždy.
Kľúčové hodnoty: √1=1, √4=2, √9=3, √16=4, √25=5, √36=6, √49=7, √64=8, √81=9, √100=10. Pre kocky: ∛1=1, ∛8=2, ∛27=3, ∛64=4, ∛125=5.
Praktické použitie: strana štvorca = √plocha, hrana kocky = ∛objem. Odmocňovanie je opak umocňovania a pomáha ti riešiť geometrické úlohy.
💡 Pre test: Ak si zapamätáš dokonalé štvorce a kocky, zvládneš 90% úloh bez problémov!
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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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