Giúp mik với nha 1/2×3+1/3×4+…+1/99×100 28/09/2021 Bởi Claire Giúp mik với nha 1/2×3+1/3×4+…+1/99×100
$\frac{1}{2.3}$+ $\frac{1}{3.4}$+…+ $\frac{1}{99.100}$ =$\frac{1}{2}$ -$\frac{1}{3}$ -$\frac{1}{3}$ -$\frac{1}{4}$+….+ $\frac{1}{99}$ -$\frac{1}{100}$ =$\frac{1}{2}$- $\frac{1}{100}$ =$\frac{50}{100}$ -$\frac{1}{100}$ =$\frac{49}{100}$ Bình luận
$\frac{1}{2.3}$ + $\frac{1}{3.4}$ +…+ $\frac{1}{99.100}$ =$\frac{1}{2}$ – $\frac{1}{3}$ + $\frac{1}{3}$ – $\frac{1}{4}$ +…+$\frac{1}{99}$ – $\frac{1}{100}$ = $\frac{1}{2}$ – $\frac{1}{100}$ = $\frac{49}{100}$ Bình luận
$\frac{1}{2.3}$+ $\frac{1}{3.4}$+…+ $\frac{1}{99.100}$
=$\frac{1}{2}$ -$\frac{1}{3}$ -$\frac{1}{3}$ -$\frac{1}{4}$+….+ $\frac{1}{99}$ -$\frac{1}{100}$
=$\frac{1}{2}$- $\frac{1}{100}$
=$\frac{50}{100}$ -$\frac{1}{100}$
=$\frac{49}{100}$
$\frac{1}{2.3}$ + $\frac{1}{3.4}$ +…+ $\frac{1}{99.100}$
=$\frac{1}{2}$ – $\frac{1}{3}$ + $\frac{1}{3}$ – $\frac{1}{4}$ +…+$\frac{1}{99}$ – $\frac{1}{100}$
= $\frac{1}{2}$ – $\frac{1}{100}$
= $\frac{49}{100}$