Question

tính nhanh:1/1.2+1/2.3 +... +1/99.100

Answer 1

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

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

=     1 - 1/100

=      99/100

Answer 2

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

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

= 1 - 1/100

= 99/100

Answer 3

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

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

=1-1/100

=99/100

Mik ko làm nhanh nhất nhưng các bạn hãy k cho mik nhé!

Answer 4

\(=\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...+\frac{1}{99}-\frac{1}{100}\)

\(=\frac{1}{1}-\frac{1}{100}=\frac{99}{100}\)