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人気のある微分積分 >

integral from 0 to 1 of 9xe^{-x^2}

解

\int_{0}^{1} 9 x e^{- x^{2}} d x

解

\frac{9 ( e - 1 )}{2 e}

+1

十進法表記

2.84454 \dots

解答ステップ

\int_{0}^{1} 9 x e^{- x^{2}} 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 e^{- x^{2}} d x

u置換積分法を適用する

= 9 \cdot \int_{0}^{- 1} - \frac{e ^{u}}{2} d u

\int_{a}^{b} f (x) d x = - \int_{b}^{a} f (x) d x, a < b

= 9 (- \int_{- 1}^{0} - \frac{e ^{u}}{2} d u)

定数を除く:

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

= 9 (- (- \frac{1}{2} \cdot \int_{- 1}^{0} e^{u} d u))

共通積分を使用する:

\int e^{u} d u = e^{u}

= 9 (- (- \frac{1}{2} [e^{u}]_{- 1}^{0}))

簡素化

9 (- (- \frac{1}{2} [e^{u}]_{- 1}^{0})) : \frac{9}{2} [e^{u}]_{- 1}^{0}

= \frac{9}{2} [e^{u}]_{- 1}^{0}

限度を計算する:

1 - \frac{1}{e}

= \frac{9}{2} (1 - \frac{1}{e})

簡素化

= \frac{9 ( e - 1 )}{2 e}

グラフ

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