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ZhenjaMax
@ZhenjaMax
August 2022
1
17
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Проверьте равенство:
[tex] \frac{1}{ \sqrt{2} + \sqrt{1} }+ \frac{1}{ \sqrt{3} + \sqrt{2} } +...+ \frac{1}{ \sqrt{100} + \sqrt{99} } = 9[/tex]
Как его проверять?
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oganesbagoyan
Verified answer
---------------------------------------
(√2 -1)/((√2 +1)(√2 -1) + (√3 -√2)/(√3 +√2)(√3 -√2) +...
+(√100 -√99)/(√100+√99)(√100 -√99) /1=
√2
-1+√3 -
√2
-1
+ ...+
√100
-√99 =√100 -1 =10-1 =9
2 votes
Thanks 2
oganesbagoyan
проверили ? спасибо !
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Answers & Comments
Verified answer
---------------------------------------
(√2 -1)/((√2 +1)(√2 -1) + (√3 -√2)/(√3 +√2)(√3 -√2) +...
+(√100 -√99)/(√100+√99)(√100 -√99) /1=
√2 -1+√3 -√2 -1 + ...+√100 -√99 =√100 -1 =10-1 =9