Tính tổng : 3/2.5+3/5.8+3/8.11+…+3/299.302 20/09/2021 Bởi Everleigh Tính tổng : 3/2.5+3/5.8+3/8.11+…+3/299.302
$\frac{3}{2.5}$ +$\frac{3}{5.8}$ +$\frac{3}{8.11}$ +…+$\frac{3}{299.302}$ =$\frac{1}{2}$ -$\frac{1}{5}$ +$\frac{1}{5}$ -$\frac{1}{8}$ +$\frac{1}{8}$ -$\frac{1}{11}$ +…+$\frac{1}{299}$ -$\frac{1}{302}$ =$\frac{1}{2}$ -$\frac{1}{302}$ =$\frac{151}{302}$ -$\frac{1}{302}$ =$\frac{150}{302}$ =$\frac{75}{151}$ . Bình luận
$\frac{3}{2.5}$ + $\frac{3}{5.8}$ + … + $\frac{3}{299.302}$ = $\frac{1}{2}$ – $\frac{1}{5}$ + $\frac{1}{5}$ – $\frac{1}{8}$ + … + $\frac{1}{299}$ – $\frac{1}{302}$ = $\frac{1}{2}$ – $\frac{1}{302}$ = $\frac{151}{302}$ – $\frac{1}{302}$ = $\frac{150}{302}$ = $\frac{75}{151}$ Bình luận
$\frac{3}{2.5}$ +$\frac{3}{5.8}$ +$\frac{3}{8.11}$ +…+$\frac{3}{299.302}$
=$\frac{1}{2}$ -$\frac{1}{5}$ +$\frac{1}{5}$ -$\frac{1}{8}$ +$\frac{1}{8}$ -$\frac{1}{11}$ +…+$\frac{1}{299}$ -$\frac{1}{302}$
=$\frac{1}{2}$ -$\frac{1}{302}$
=$\frac{151}{302}$ -$\frac{1}{302}$
=$\frac{150}{302}$ =$\frac{75}{151}$ .
$\frac{3}{2.5}$ + $\frac{3}{5.8}$ + … + $\frac{3}{299.302}$
= $\frac{1}{2}$ – $\frac{1}{5}$ + $\frac{1}{5}$ – $\frac{1}{8}$ + … + $\frac{1}{299}$ – $\frac{1}{302}$
= $\frac{1}{2}$ – $\frac{1}{302}$
= $\frac{151}{302}$ – $\frac{1}{302}$
= $\frac{150}{302}$
= $\frac{75}{151}$