Question

Tính:

1/1x2 + 1/2x3 + ... + 1/99x100

Answer 1

\(\frac{99}{100}\)

Answer 2

1/1.2+1/2.3+....+1/99.100

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

=1/1-1/100=100/100-1/100=99/100

Answer 3

99/100

tick nha tui tick lại

Answer 4

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

<=> A = 1/1 - 1/2 + 1/2 - 1/3 + .... + 1/99 - 1/100

<=> A = 1/1 - 1/100

<=> A = 1 - 1/100

=> A = 99/100

Answer 5

= 99/100

Tick nhé