Question

4/11x16+4/16x21+4/21x26+...+4/61x66 CÁC BN GIẢI HỘ MIK VS

Answer 1

ối dồi ôi khó thế

Answer 2

Google sinh ra để làm j bn

Answer 3

\(\frac{4}{11.16}+\frac{4}{16.21}+...+\frac{4}{61.66}\)

\(=\frac{4}{11}-\frac{4}{16}+\frac{4}{16}-\frac{4}{21}+...+\frac{4}{61}-\frac{4}{66}\)

\(=\frac{4}{11}-\frac{4}{66}\)

\(=\frac{4}{11}-\frac{2}{33}\)

\(=\frac{12}{33}-\frac{2}{33}\)

\(=\frac{10}{33}\)

Answer 4

0,8x(1/11-1/16+1/16-1/21+...+1/61-1/66)
0,8x(1/11-1/66)
0,8x(5/66)
4/66
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