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人気のある微分積分 >

sum from n=1 to infinity of (2/7)^n

解

n = 1 \sum \infty (\frac{2}{7})^{n}

解

\frac{2}{5}

+1

十進法表記

0.4

解答ステップ

n = 1 \sum \infty (\frac{2}{7})^{n}

n = k \sum \infty (a_{n}) = n = 0 \sum \infty (a_{n}) - a_{0} - a_{1} - \dots a_{k - 1}

= n = 0 \sum \infty (\frac{2}{7})^{n} - (\frac{2}{7})^{0}

n = 0 \sum \infty (\frac{2}{7})^{n} = \frac{7}{5}

= \frac{7}{5} - (\frac{2}{7})^{0}

簡素化

\frac{7}{5} - (\frac{2}{7})^{0} : \frac{2}{5}

= \frac{2}{5}

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