Question

Chứng minh rằng  A=1/1.2+1/2.3+.....+1/99.100 ko là số nguyên

Answer 1

A = 1/1.2 + 1/2.3 + 1/3.4 + .... + 1/99.100

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

A = 1/1 - 1/100

A=  100/100 - 1/100

A=  99/100

Answer 2

A = 1/1.2 + 1/2.3 + 1/3.4 + .... + 1/99.100

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

A= 1/1 - 1/100

A = 100 / 100 - 1/100

A= 99/100

Answer 3

Này SU SI !!!

A = 1/1.2 + 1/2.3 + 1/3.4 + .... + 1/99.100

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

A = 1/1 - 1/100

A=  100/100 - 1/100

A=  99/100

Answer 4

A = 1/1.2 + 1/2.3 + 1/3.4 + .... + 1/99.100

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

A = 1/1 - 1/100

A=  100/100 - 1/100

A=  99/100