CMR = $\frac{1}{1.2}$ + $\frac{1}{3.4}$ + $\frac{1}{5.6}$ +…+ $\frac{1}{49.50}$ = $\frac{1}{26}$ + $\frac{1}{27}$ +….+ $\frac{1}{50}$

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Môn Toán Delwyn 4 years 2020-10-13T08:56:49+00:00 2020-10-13T08:56:49+00:00 1 Answers 111 views 0

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Captcha* Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )

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Adela · Answer 1 · 2020-10-13T08:58:03+00:00

Adela

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2020-10-13T08:58:03+00:00 October 13, 2020 at 8:58 am

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`VT=1-1/2+1/3-1/4+…+1/49-1/50`

`=(1+1/2+1/3+…+1/50)-2(1/2+1/4+…+1/50)`

`=1+1/2+1/3+…+1/50-1-1/2-…-1/25`

`=1/26+1/27+…+1/50=VP`