Question

1/4+1/28+1/70+1/130+1/208 dang gi vay mn lam thanh bai giai ho minh nha

Answer 1

\(\frac{1}{4}+\frac{1}{28}+\frac{1}{70}+\frac{1}{130}+\frac{1}{208}\)

\(=\frac{1}{1\times4}+\frac{1}{4\times7}+\frac{1}{7\times10}+\frac{1}{10\times13}+\frac{1}{13\times16}\)

\(=1-\frac{1}{4}+\frac{1}{4}-\frac{1}{7}+\frac{1}{7}-\frac{1}{10}+\frac{1}{10}-\frac{1}{13}+\frac{1}{13}-\frac{1}{16}\)

\(=1-\frac{1}{16}=\frac{15}{16}\)

Chúc bạn học tốt ^^

Answer 2

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