China | A Very Nice Algebra Problem | Math Olympiad

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[@economicsonline]

Don't waste 30 seconds at the start of the video rewriting the problem. We already see the problem.

[@melissajenner8068]

Agree

[@orenawaerenyeager]

I did 2x but still got frustrated Though the ending was little good so it's ok

[@where_is_sauce]

It's an habit, i also do this, it helps me know what to do next

[@Mb-logic]

😂

[@seringoften]

@@where_is_sauceyess it's a brain stimulus

[@user-lh7yp7vz7j]

This is nice olimpic task in China, my IQ was growing during this video, Thx

[@Ayanokoji-k-x2b]

Me after seeing this video my IQ level📈📈📈😂

[@nemesisk79]

Very nice!

[@user-nd2ve5wf2l]

Nice!!!

[@rekhagoyal924]

Nice one 👍👍👍👍 Easy but looks like a hard one ...

[@kabeeralishaikh1439]

Wow

[@neilgreiman1840]

Ez

[@zubayrzubayr6848]

Super

[@Ayanokoji-k-x2b]

❤❤❤❤

[@proximitygaming8253]

did this in 1 min with substitution. nice problem!

[@edsonlohanouo8020]

Some day I want to became this bro... Excellent video

[@user-ee7in6wf5t]

Law of distribution and rationalization

[@Ahmed-kg2gf]

Easy problem , i solved it in the same way , great minds think alike

[@electrokid638]

Blud really said he is great

[@Ahmed-kg2gf]

@@electrokid638 it is just a saying

[@williamribeiro4622]

beautiful

[@AnsvarligFrist]

Uff!

[@user-ns7dc4xp7m]

素晴らしい解答だね。感心しました。

[@user-md1gh1ez5y]

Supose X=...👍

[@BSrour-lv1co]

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.

[@UKPEINDANIELU.]

Fantastic

[@duhan9210]

As a turkish i confirm they are asking this questions us for entering university 💀💀

[@Ametiramisucugum]

I am from Turkiye bro

[@mustafaefegergin786]

abi ne zaman geldi böyle bir soru gözünü seviyim en basit haliyle eşlenik çıkıyor

[@mustafaylmaz-vq7dy]

​@@mustafaefegergin78621de sordukları soru yerine bunu sorsalardı çözerdim

[@tamarshahverdyan2723]

# 4#

[@tamarshahverdyan2723]

# 91 #

[@cajun2106]

Lol i was wondering why 15 became 3.5 it was multiplication 💀 im used to parenthesis

[@user-ig8de5jf6h]

Расскажите человеку, что можно печатать ;))))

[@webanut]

... = √1,75 + √0.75. :)

[@Yacoub12]

😂😂😂😂😂😂

[@Nsnow-gr6ux]

It's satisfying 🥲

[@sophiaramirez7314]

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)

[@seringoften]

take the (5^1/2 + 7^1/2) out

[@user-os8st5ir3u]

√4+√5=2√5 это как?

[@claudionarciso8190]

Very good 👏

[@Lol32338]

Yeah 👍

[@xyz.ijk.]

Woh -- @3:05 you skip the most critical step. No idea how you got from the ones or the other

[@robinsailo5652]

Just take the common factor out. Here in this case it's (√5+√7)

[@xyz.ijk.]

@@robinsailo5652 Oh, yes ... I don't know why I didn't see that, but thank you pointing it out. The rest was clear.

[@user-cf8xt7kw3m]

почему когда извлекается квадратный корень учитывается только положительное число?

[@welcome-to-boro]

В каком моменте видео это?

[@daddykhalil909]

I asked the same question

[@user-qy8re3yx3d]

(V7+V3)/2 Удобно преобразовывать обратную дробь.

[@daddykhalil909]

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

[@manishhemantPiMan]

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

[@daddykhalil909]

@@manishhemantPiMan not correct. The sqrt of anything can be pos OR neg.

[@manishhemantPiMan]

@@daddykhalil909 if you dont believe me just google if square root of anything can be negative

[@ironspidey0]

@@daddykhalil909 learn about principal roots

[@robinsailo5652]

​@@daddykhalil909No it can only give out positive number

[@salahouldaya4958]

Dont put dots between numbers like 3.5 but 3*5

[@malteschluter4516]

Why he schould not use dots? It's for multiplication.

[@saviplayer4546]

​@@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]

@saviplayer4546 Yes, you are right... I made a mistake.. but look, my other comment on the dot multiplication is removed by the admin.. I was right about it.. I highlighted your comments to show everyone about my mistake, but he hid his mistake by deleting my comment.

[@dinum9401]

@malteschluter4516 admin deleted my comment because he can't accept his mistake, which is disappointing. So I'm writing this again.. In maths, we can not use the dot multiplication everywhere because it's a different method of multiplication. It's different than the cross multiplication. We use it to multiply vectors. Admin, Don't delete this, too. Admit your mistake instead.

[@saviplayer4546]

@@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

[@FitzWilliamSS]

Could be so simple. People are good in math are awful teaching. Sad 😢

[@Vapour120576]

Задача нормальная. Но убожество типа рисования решения в графическом редакторе типа paint paint убивает какое-либо желание смотреть этот канал в дальнейшем. Дизлайк.

[@echandler]

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.

[@nanglatoi]

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