Question

A=3/7x10+3/10x13+3/13x16+..........+3/97x100. = ?

Answer 1

A= 1/7 - 1/10 + 1/10 - 1/13 + 1/13 - 1/16 + .... + 1/97 - 1/100

A= 1/7 - 1/100

A= 93/700

Answer 2

\(A=\frac{3}{7.10}+\frac{3}{10.13}+\frac{3}{13.16}+...+\frac{3}{97.100}\)

\(A=\frac{1}{7}-\frac{1}{10}+\frac{1}{10}-\frac{1}{13}+\frac{1}{13}-\frac{1}{16}+...+\frac{1}{37}-\frac{1}{100}\)

\(A=\frac{1}{7}-\frac{1}{100}\)

\(A=\frac{93}{700}\)

Answer 3

Xin lỗi, mình nhầm. Phải bằng 97/700 mới đúng