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人気のある微分積分 >

sum from n=1 to infinity of (0.2)^n

解

n = 1 \sum \infty (0.2)^{n}

解

0.25

解答ステップ

n = 1 \sum \infty 0. 2^{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 0. 2^{n} - 0. 2^{0}

n = 0 \sum \infty 0. 2^{n} = 1.25

= 1.25 - 0. 2^{0}

簡素化

= 0.25

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