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人気のある微分積分 >

integral from 0 to 5 of 2piy(25-y^2)

解

\int_{0}^{5} 2 π y (25 - y^{2}) d y

解

\frac{625 π}{2}

+1

十進法表記

981.74770 \dots

解答ステップ

\int_{0}^{5} 2 π y (25 - y^{2}) d y

定数を除く:

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

= 2 π \cdot \int_{0}^{5} y (25 - y^{2}) d y

拡張

y (25 - y^{2}) : 25 y - y^{3}

= 2 π \cdot \int_{0}^{5} 25 y - y^{3} d y

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

= 2 π (\int_{0}^{5} 25 y d y - \int_{0}^{5} y^{3} d y)

\int_{0}^{5} 25 y d y = \frac{625}{2}

\int_{0}^{5} y^{3} d y = \frac{625}{4}

= 2 π (\frac{625}{2} - \frac{625}{4})

簡素化

2 π (\frac{625}{2} - \frac{625}{4}) : \frac{625 π}{2}

= \frac{625 π}{2}

グラフ

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