Можно проще а=1/(1/а) Тогда 1/(1/(sqrt 3+sqrt 5)+1/(sqrt 5+sqrt 7)) Умножить на сопряженный множитель 1/((sqrt 5-sqrt 3)/2+(sqrt 7-sqrt5)/2) Тогда 1/((sqrt 7-sqrt 3))/2=2/(sqrt 7-sqrt 3)=(sqrt 7+sqrt 3)/2 И никаких лишних замен
Simplifying a numerical expression using factoring and rationalisation is not algebra, there's no unknown. The goal behind using of the word algebra is to impress an audience. A mathematician is not supposed to play this kind of game; leave that to politicians.
You make a valid point. Simplifying numerical expressions using factoring and rationalization is more about arithmetic than algebra, as there's no unknown variable involved. The use of the term 'algebra' might indeed be misleading in this context.
Решала так же. И ответ тот же. Только для того, чтоб понять, что (1+2**1/2)**3=7+5*2**1/2, что неочевидно, решала систему х**3+6*х*у**2=7 3*х**2*у+2*у**3=5, где искомое число=х+у**2**1/2
Отличный способ решения! Действительно, соотношение (1+2^(1/2))^3 = 7 + 5 * 2^(1/2) неочевидно, и система уравнений помогает прояснить ситуацию. Приятно видеть такие интересные подходы!
It is not related to "Olympiad". It is just a middle level to hard level question in normal middle school (grade 7-9) exam. Everything used here is basic knowledge. Middle to hard level: if there are level 1 to 10 (larger means harder), the question should be in level 7 - 8.
0:03 during your solution you dropped a lot of facts: the sqrt of any number is +/- Also when you divide by a symbol you should suppose that it is not zero
3:51 ¿Que paso con √3 y √5 que multiplicaban las operaciones? Desaparecieron (Si alguien puede ser tan amable de responder mi pregunta se los agradecería mucho)
@dinum94015 is the square root of 25 tho. rt ab = rt x rtb rt 25 = rt(5 x 5) = rt5 x rt5. Which is also 5 Plus he did it to factorize the numerator tonget (rt3 + rt5)(rt5 + 7)
@dinum9401 Well, generally when people use multiplication in algebra They use dots to not confuse with the multiplication symbol (x) with x the most common letter used for algebra. Like instead of 3xx it'll be 3∙x make it less confusing. But yeah the admin could've at least explained himself instead of just deleted it
@@malteschluter4516 “Why he should not use dots? It's for multiplication.” No! The character ‘.’ is not a multiplication dot, it is a period dot. This is how it looks in the scripture, and this is the only problem. Star * is also not a good operator character, it is used only in programming.
@dinum9401 “Admin, don't delete this, too. Admit your mistake instead.” Most likely, this is just the RUclips bugs. Lately, the comments disappear more and more often, it looks like the team adds more bugs. No notifications, and the effect looks random. The comments are not removed, you can find them in your comment history, they are just not presented on a page, but you can see your invisible comment if you load the page with a different URI, the one provided in your comment history. What a mess!
Задача нормальная. Но убожество типа рисования решения в графическом редакторе типа paint paint убивает какое-либо желание смотреть этот канал в дальнейшем. Дизлайк.
In my opinion, the graphic editor is *not* the big problem. It is showing all of the routine algebraic manipulations one after another instead of what might be done on a blackboard by crossing out and replacing. x = something y = something-equivalent is used instead of x = {something} {something else} or x = something = something-else Showing all of the intermediate steps *may* be appropriate for those not practiced in algebra. However, this level of detail takes up more visual space and obscures the underlying *insights* which are the most important. One thing done well here is using substitution of variables instead for raw numbers. I enjoy it more when a problem is solved in somewhat abstract fashion, then back-substituted at the end. Just my opinion. I am probably *not* the target audience at which this video may be directed. When I was in school, back when dinosaurs roamed the earth, calculators were large *mechanical* beasts which were used for business and accounting. We just had pen and paper, math tables and slide rules.
Don't waste 30 seconds at the start of the video rewriting the problem. We already see the problem.
Agree
I did 2x but still got frustrated
Though the ending was little good so it's ok
It's an habit, i also do this, it helps me know what to do next
😂
@@BRAZILIAN_MIKUyess it's a brain stimulus
Можно проще
а=1/(1/а)
Тогда
1/(1/(sqrt 3+sqrt 5)+1/(sqrt 5+sqrt 7))
Умножить на сопряженный множитель
1/((sqrt 5-sqrt 3)/2+(sqrt 7-sqrt5)/2)
Тогда
1/((sqrt 7-sqrt 3))/2=2/(sqrt 7-sqrt 3)=(sqrt 7+sqrt 3)/2
И никаких лишних замен
This is a typical task for admission to a Turkish university. Since when did this simple task become an "Olympiad" task?
I thought the same thing😂
Me too turkishh 👋🏻
@@PBGAGA”Im am turkısh too” olacak. Türk olduğunu anladık knk ÇŞGBNSVKMIOBG
Я выпуск 1999 года и решил задачу мне 42 года. Учился ещё по советским шаблонам.
This is nice olimpic task in China, my IQ was growing during this video, Thx
Nice one 👍👍👍👍
Easy but looks like a hard one ...
Lengthy one for sure
Simplifying a numerical expression using factoring and rationalisation is not algebra, there's no unknown. The goal behind using of the word algebra is to impress an audience. A mathematician is not supposed to play this kind of game; leave that to politicians.
It is algebra. You know there are computer algebra systems trying to simplify radicals, without numerical evaluation and this is NOT solved 100%
You make a valid point. Simplifying numerical expressions using factoring and rationalization is more about arithmetic than algebra, as there's no unknown variable involved. The use of the term 'algebra' might indeed be misleading in this context.
3:22 Where did the √3 and √5 in the numerator go?
Lol i was wondering why 15 became 3.5 it was multiplication 💀 im used to parenthesis
It's basic arithmetic 💀
nice one thank you
Me after seeing this video my IQ level📈📈📈😂
Решала так же. И ответ тот же. Только для того, чтоб понять, что (1+2**1/2)**3=7+5*2**1/2, что неочевидно, решала систему х**3+6*х*у**2=7
3*х**2*у+2*у**3=5, где искомое число=х+у**2**1/2
Правую часть умножаем, а левую где х почему не умножаем?
Отличный способ решения! Действительно, соотношение (1+2^(1/2))^3 = 7 + 5 * 2^(1/2) неочевидно, и система уравнений помогает прояснить ситуацию. Приятно видеть такие интересные подходы!
Some day I want to became this bro... Excellent video
great🎉
ممتاز GOOD
It is not related to "Olympiad". It is just a middle level to hard level question in normal middle school (grade 7-9) exam. Everything used here is basic knowledge. Middle to hard level: if there are level 1 to 10 (larger means harder), the question should be in level 7 - 8.
Excellent 👌🙏🙏.
Which application do you use ?
Niceuhhh😊
Very beautiful problem^^
This is not an algebra problem, but an arithmetic one
Nice video
Meanwhile, me already calculated the value in my mind which is approximately 2.2😂😂😂
Bravo
Existe um erro... ele transforma raiz de 4 x raiz de 5 em 2 x raiz de 5...Tá certo isso?
amazing！！！
beautiful
Very good 👏
Yeah 👍
did this in 1 min with substitution. nice problem!
Я бы ещё √7 и √3 заменила на √9 и √4 чтобы было красиво в конце)
Avarege high school problem in Turkey. How can that be a olimpiads problem 😭☠️
Inpes tasi pantasan bayakya yang berinpestasidan menam saham karna utk bertaruh bila menang akan mendapatkan ke untungan.
Very nice!
Super
Thanks
But how 2 is equal to square root 5.may be possible.
Nice!!!
Beautiful solution
Woh -- @3:05 you skip the most critical step. No idea how you got from the ones or the other
@robinsailo5652 Oh, yes ... I don't know why I didn't see that, but thank you pointing it out. The rest was clear.
(sqrt 5 + sqrt 7) is common factor
@@jadehuynh7234 Thank you! This is clarifying.
почему когда извлекается квадратный корень учитывается только положительное число?
В каком моменте видео это?
I asked the same question
@@welcome-to-boroпо определению корня квадратного ЯАРИЫМЕТИЧЕСКОГО: это НЕотрицательное число, квадрат которого есть подкоренное
It's satisfying 🥲
Super annoying music
Зачем переписывать уже написанный пример вначале??
Чтобы по итогу записать ответ
素晴らしい解答だね。感心しました。
Строго говоря, корень из четырех равен +/-2
Wow
والله مليت من طرق الحل
Easy problem , i solved it in the same way , great minds think alike
Blud really said he is great
@@electrokid638 it is just a saying
Скромно вы о себе!
How you spend one year to solve an small probleme, you need only two minutes to do this, it look like night club, not equation,
0:03 during your solution you dropped a lot of facts: the sqrt of any number is +/-
Also when you divide by a symbol you should suppose that it is not zero
No sqrt of a constant number is always positive…only when sqrt of a variable say x is taken it become mod x which becomes +/- x
@@manishhemantPiMan not correct. The sqrt of anything can be pos OR neg.
@@daddykhalil909 if you dont believe me just google if square root of anything can be negative
@@daddykhalil909 learn about principal roots
en.wikipedia.org/wiki/Square_root
ezy prb
این خیلی خیلی خیلی راحته
عجیبه که حل همچین سوالی براتون سخته
He didnt told that it was hard??
How did square root 4 times square root 5 become 2 times square root 5?!
_/4*5 = 2*_/5...... _/4 = 2 so
The equation≈24
Fantastic
√3（√5+√7）+√5（√5+√7）
/（√5+√5+√3+√7）
=
As a turkish i confirm they are asking this questions us for entering university 💀💀
I am from Turkiye bro
abi ne zaman geldi böyle bir soru gözünü seviyim en basit haliyle eşlenik çıkıyor
@@wizardx0821de sordukları soru yerine bunu sorsalardı çözerdim
You are liar 😂😂
It takes me approximately 30 seconds to solve this
One can do it verbally
❤❤❤❤
How is root 25 5.5 and not 5?
They didn't put 5.5, they put 5•5.
Root 25= Root 5.5= 5 (they are all equal)
Domans , good for 101 maths refreshing 😂❤
Ridiculo tanto trabajo para seguir dejando raíces
bi bok anlamadım çünkü türküm ve 7. sınıfım bide mal gibi gelip bu videoyuizliyorum emeklerin için sağol kral
Knk 7.sınıfta karekök yok ama sen bilirsin. Bu arada türk olmana da bağlı değil ben yaptım mesela 9.sınıfım
Ez
Let use casio calculator, it spend about 1 min 😅
3:51 ¿Que paso con √3 y √5 que multiplicaban las operaciones? Desaparecieron
(Si alguien puede ser tan amable de responder mi pregunta se los agradecería mucho)
take the (5^1/2 + 7^1/2) out
Look at the whole numerator. (√5 + √7) is present twice. It can be factored out.
a(c + d) + b(c + d) = (a + b)(c + d).
5.5444
(V7+V3)/2 Удобно преобразовывать обратную дробь.
Bazi durumlari iki kere yazmak sacma zaman kaybi bunlari çözerken hizli olmak gerekli
Law of distribution and rationalization
I Just don't understand the 6:30 part
Расскажите человеку, что можно печатать ;))))
azərbaycan respublika fənn olimpiadası bundan cətindir
Supose X=...👍
ответ: корень из 8.8
Dont put dots between numbers like 3.5 but 3*5
Why he schould not use dots? It's for multiplication.
@dinum94015 is the square root of 25 tho.
rt ab = rt x rtb
rt 25 = rt(5 x 5) = rt5 x rt5. Which is also 5
Plus he did it to factorize the numerator tonget (rt3 + rt5)(rt5 + 7)
@dinum9401 Well, generally when people use multiplication in algebra They use dots to not confuse with the multiplication symbol (x) with x the most common letter
used for algebra. Like instead of 3xx it'll be 3∙x make it less confusing.
But yeah the admin could've at least explained himself instead of just deleted it
@@malteschluter4516 “Why he should not use dots? It's for multiplication.” No! The character ‘.’ is not a multiplication dot, it is a period dot. This is how it looks in the scripture, and this is the only problem. Star * is also not a good operator character, it is used only in programming.
@dinum9401 “Admin, don't delete this, too. Admit your mistake instead.” Most likely, this is just the RUclips bugs. Lately, the comments disappear more and more often, it looks like the team adds more bugs. No notifications, and the effect looks random. The comments are not removed, you can find them in your comment history, they are just not presented on a page, but you can see your invisible comment if you load the page with a different URI, the one provided in your comment history. What a mess!
# 4#
# 91 #
👍👍👍👍😀🇧🇷🇧🇷
... = √1,75 + √0.75. :)
😂😂😂😂😂😂
Uff!
Idk is the awnser
√4+√5=2√5 это как?
√20=√4 x √5=2√5= √5 + √5
I already calculated it and it's 1 😅
Not even close.
Deliye anlatır gibi anlatmanın gereği var mı 😕
केवल बेवकूफ बना रहा है,अगर इतना बड़ा उत्तर होगा तो किसी competition में नहीं आएगा
Could be so simple. People are good in math are awful teaching. Sad 😢
Задача нормальная. Но убожество типа рисования решения в графическом редакторе типа paint paint убивает какое-либо желание смотреть этот канал в дальнейшем. Дизлайк.
In my opinion, the graphic editor is *not* the big problem. It is showing all of the routine algebraic manipulations one after another instead of what might be done on a blackboard by crossing out and replacing.
x = something
y = something-equivalent
is used instead of x = {something} {something else}
or
x = something = something-else
Showing all of the intermediate steps *may* be appropriate for those not practiced in algebra. However, this level of detail takes up more visual space and obscures the underlying *insights* which are the most important.
One thing done well here is using substitution of variables instead for raw numbers. I enjoy it more when a problem is solved in somewhat abstract fashion, then back-substituted at the end.
Just my opinion. I am probably *not* the target audience at which this video may be directed. When I was in school, back when dinosaurs roamed the earth, calculators were large *mechanical* beasts which were used for business and accounting. We just had pen and paper, math tables and slide rules.
А степень "подробности" решения ? Для того, кто здесь радикал встретил первый раз в жизни?
√25=5 u video no sense bro
Любой двоечник с первого раза решит...
3.2
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