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人気のある微分積分 >

integral from 0 to 1 of 9x^8(4-x^9)

解

\int_{0}^{1} 9 x^{8} (4 - x^{9}) d x

解

\frac{7}{2}

+1

十進法表記

3.5

解答ステップ

\int_{0}^{1} 9 x^{8} (4 - x^{9}) d x

定数を除く:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= 9 \cdot \int_{0}^{1} x^{8} (4 - x^{9}) d x

拡張

x^{8} (4 - x^{9}) : 4 x^{8} - x^{17}

= 9 \cdot \int_{0}^{1} 4 x^{8} - x^{17} d x

総和規則を適用する:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= 9 (\int_{0}^{1} 4 x^{8} d x - \int_{0}^{1} x^{17} d x)

\int_{0}^{1} 4 x^{8} d x = \frac{4}{9}

\int_{0}^{1} x^{17} d x = \frac{1}{18}

= 9 (\frac{4}{9} - \frac{1}{18})

簡素化

9 (\frac{4}{9} - \frac{1}{18}) : \frac{7}{2}

= \frac{7}{2}

グラフ

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