$\frac{n}{6} (n + 1)(2n + 1) - \frac{n - 1}{6} (n + - 1 + 1)(2(n - 1) + 1)$

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Mathematics Edana Edana 4 years 2021-09-03T05:54:07+00:00 2021-09-03T05:54:07+00:00 1 Answers 2 views 0

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

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thienhuong · Answer 1 · 2021-09-03T05:55:31+00:00

thienhuong

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2021-09-03T05:55:31+00:00 September 3, 2021 at 5:55 am

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Answer:

N2

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