Question

Tinh

A= 1/1.2+1/2.3+1/3.4+1/4.5+1/5.6+1/6.7+1/7.8+1/8.9+1/.910+1/10.11+1/12.13

 co loi giai ha

 

Answer 1

=12/13 may ban oi lam loi giai ra cho minh vui

Answer 2

mk xin lỗi mk mới hok lớp 5

Answer 3

A= 1/1.2+1/2.3+1/3.4+1/4.5+1/5.6+1/6.7+1/7.8+1/8.9+1/.910+1/10.11+1/12.13

  = 1- 1/2 + 1/2 - 1/3 + ......+1/12 - 1/13

  = 1- 1/13

  = 12/13

Answer 4

12/13 chứ bao nhiêu lớp 4 còn dễ

Answer 5

A= 1/1.2+1/2.3+1/3.4+1/4.5+1/5.6+1/6.7+1/7.8+1/8.9+1/.910+1/10.11+1/12.13

\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...+\frac{1}{12}-\frac{1}{13}\)

\(=1-\frac{1}{13}\)

\(=\frac{12}{13}\)

Answer 6

1/1.2+1/2.3+1/3.4+1/4.5+1/5.6+1/6.7+1/7.8+1/8.9+1/9.10+1/10.11+1/11.12+1/12.13

= 1/1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10+1/10-1/11+1/1-1/12+1/12-1/13

= 1/1+0+1/13

= 14/13