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人気のある微分積分 >

integral from 0 to 1 of 3x(x^2+1)^3

解

\int_{0}^{1} 3 x (x^{2} + 1)^{3} d x

解

\frac{45}{8}

+1

十進法表記

5.625

解答ステップ

\int_{0}^{1} 3 x (x^{2} + 1)^{3} d x

定数を除く:

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

= 3 \cdot \int_{0}^{1} x (x^{2} + 1)^{3} d x

拡張

x (x^{2} + 1)^{3} : x^{7} + 3 x^{5} + 3 x^{3} + x

= 3 \cdot \int_{0}^{1} x^{7} + 3 x^{5} + 3 x^{3} + x 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

= 3 (\int_{0}^{1} x^{7} d x + \int_{0}^{1} 3 x^{5} d x + \int_{0}^{1} 3 x^{3} d x + \int_{0}^{1} x d x)

\int_{0}^{1} x^{7} d x = \frac{1}{8}

\int_{0}^{1} 3 x^{5} d x = \frac{1}{2}

\int_{0}^{1} 3 x^{3} d x = \frac{3}{4}

\int_{0}^{1} x d x = \frac{1}{2}

= 3 (\frac{1}{8} + \frac{1}{2} + \frac{3}{4} + \frac{1}{2})

簡素化

3 (\frac{1}{8} + \frac{1}{2} + \frac{3}{4} + \frac{1}{2}) : \frac{45}{8}

= \frac{45}{8}

グラフ

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