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人気のある微分積分 >

sum from n=1 to infinity of (5/7)^n

解

n = 1 \sum \infty (\frac{5}{7})^{n}

解

\frac{5}{2}

+1

十進法表記

2.5

解答ステップ

n = 1 \sum \infty (\frac{5}{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{5}{7})^{n} - (\frac{5}{7})^{0}

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

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

簡素化

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

= \frac{5}{2}

人気の例

sum from n=3 to infinity of 1/(2^n-5)

n = 3 \sum \infty \frac{1}{2 ^{n} - 5}

sum from n=1 to infinity of (7+4/n)^{-n}

n = 1 \sum \infty (7 + \frac{4}{n})^{- n}

sum from n=0 to infinity of n/(n+3)

n = 0 \sum \infty \frac{n}{n + 3}

sum from n=0 to infinity of 5+2(-1)^n

n = 0 \sum \infty 5 + 2 (- 1)^{n}

sum from n=0 to infinity of 14(2/3)^n

n = 0 \sum \infty 14 (\frac{2}{3})^{n}