Question

Tính giá trị biểu thức

\(\frac{2}{3.5}+\frac{2}{5.7}+\frac{2}{7.9}+......1\frac{2}{41.43}\)

Answer 1

2/3.5 + 2/5.7 + 2/7.9 + ... + 2/41.43

= 1/3 - 1/5 + 1/5 - 1/7 + 1/7 - 1/9 + ... + 1/41 - 1/43

= 1/3 - 1/43

= 40/129

ỦNG HỘ NHA

Answer 2

2/3.5 + 2/5.7 + 2/7.9 +......+ 2/41.43

= 1/3-1/5 + 1/5-1/7 + 1/7-1/9 +.....+ 1/41-1/43

= 1/3-1/43

= 40/129.

Answer 3

40/129 chuẩn 100% luôn

Answer 4

40/129 đó