Toán Giaỉ hộ mình nha mọi người 1/1.2 + 1/2.3 + 1/3.4 + 1/4.5 +…+ 1/99.100 10/09/2021 By Hadley Giaỉ hộ mình nha mọi người 1/1.2 + 1/2.3 + 1/3.4 + 1/4.5 +…+ 1/99.100
$\frac{1}{1.2}$ + $\frac{1}{2.3}$ + $\frac{1}{3.4}$ + $\frac{1}{4.5}$ + … + $\frac{1}{99.100}$ = 1 – $\frac{1}{2}$ + $\frac{1}{2}$ – $\frac{1}{3}$ + $\frac{1}{3}$ – $\frac{1}{4}$ + $\frac{1}{4}$ – $\frac{1}{5}$ + … + $\frac{1}{99}$ – $\frac{1}{100}$ = 1 – $\frac{1}{100}$ = $\frac{100}{100}$ – $\frac{1}{100}$ = $\frac{99}{100}$ Trả lời
1/1×2 +1/2×3+1/3×4+1/4×5+…+1/99×100 =1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+…+1/99-1/100 =1-1/100 =99/100 HỌC TỐT! Trả lời
$\frac{1}{1.2}$ + $\frac{1}{2.3}$ + $\frac{1}{3.4}$ + $\frac{1}{4.5}$ + … + $\frac{1}{99.100}$
= 1 – $\frac{1}{2}$ + $\frac{1}{2}$ – $\frac{1}{3}$ + $\frac{1}{3}$ – $\frac{1}{4}$ + $\frac{1}{4}$ – $\frac{1}{5}$ + … + $\frac{1}{99}$ – $\frac{1}{100}$
= 1 – $\frac{1}{100}$
= $\frac{100}{100}$ – $\frac{1}{100}$
= $\frac{99}{100}$
1/1×2 +1/2×3+1/3×4+1/4×5+…+1/99×100
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+…+1/99-1/100
=1-1/100
=99/100
HỌC TỐT!