Question

A=1/1*2+1/2*3+1/3*4+......+1/99*100 so sanh voi 1

Answer 1

A = 1/1×2 + 1/2×3 + 1/3×4 + .. + 1/99×100

A = 1 - 1/2 + 1/2 - 1/3 + 1/3 - 1/4 + ... + 1/99 - 1/100

A = 1 - 1/100 < 1

Answer 2

\(A=\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{99.100}\)

\(A=1\left(\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{99}-\frac{1}{100}\right)\)

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

=>  ĐPCM

Answer 3

Ta có:

A = 1/1 x 2 + 1/2 x 3 + 1/3 x 4 + ..... + 1/99 x 100 

A = 1- 1/2 + 1/2 - 1 /3 + 1/3 - 1/4 + ..... + 1/99 - 1/100 

A = 1 - 1/100 < 1 

nha bn 

chúc bn học giỏi

Answer 4

Bọn copy

Answer 5

soyeon_Tiểu bàng giải ơ mình đâu cóp

Answer 6

T ns con kia

Answer 7

Thanks!!!!!!!!!!!!!!!!!!!!!!