Question

Tính:

M = \(\frac{2}{3x5}\)+ \(\frac{2}{5x7}\)+ \(\frac{2}{7x9}\)+ ........ + \(\frac{2}{97x99}\)

Giúp mình với, x là nhân nhé

Answer 1

M=1/3-1/5+1/5-1/7+.....+1/97-1/99

M=1/3-1/199

M=32/99

Answer 2

\(M=\frac{2}{3.5}+\frac{2}{5.7}+\frac{2}{7.9}+...+\frac{2}{97.99}\)

\(M=\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+\frac{1}{7}-\frac{1}{9}+...+\frac{1}{97}-\frac{1}{99}\)

\(M=\frac{1}{3}-\frac{1}{99}\)

\(M=\frac{32}{99}\)

~Học tốt~

Answer 3

\(M=\frac{2}{3.5}+\frac{2}{5.7}+...+\frac{2}{97.99}\)

     \(=\)\(1-\frac{1}{3}+\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+...+\frac{1}{97}-\frac{1}{99}\)

     \(=\)\(1-\frac{1}{99}\)

     \(=\)\(\frac{98}{99}\)

vậy \(M=\frac{98}{99}\)

Answer 4

mk lộn M= 32/99