B = 1/6.10 + 1/10.14 + 1/14.18 + … + 1/402.406 06/09/2021 Bởi Ximena B = 1/6.10 + 1/10.14 + 1/14.18 + … + 1/402.406
B = $\frac{1}{6.10}$ + $\frac{1}{10.14}$ +….+ $\frac{1}{402.406}$ 4B = $\frac{4}{6.10}$ + $\frac{4}{10.14}$ +….+ $\frac{4}{402+406}$ 4B = $\frac{1}{6}$ – $\frac{1}{10}$ + $\frac{1}{10}$ – $\frac{1}{14}$ +….+ $\frac{1}{402}$ – $\frac{1}{406}$ 4B = $\frac{1}{6}$ – $\frac{1}{406}$ 4B = $\frac{100}{609}$ B = $\frac{25}{609}$ Bình luận
Học tốt.
B = $\frac{1}{6.10}$ + $\frac{1}{10.14}$ +….+ $\frac{1}{402.406}$
4B = $\frac{4}{6.10}$ + $\frac{4}{10.14}$ +….+ $\frac{4}{402+406}$
4B = $\frac{1}{6}$ – $\frac{1}{10}$ + $\frac{1}{10}$ – $\frac{1}{14}$ +….+ $\frac{1}{402}$ – $\frac{1}{406}$
4B = $\frac{1}{6}$ – $\frac{1}{406}$
4B = $\frac{100}{609}$
B = $\frac{25}{609}$