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受欢迎的微积分 >

integral from 0 to 1 of 3e^{-7sqrt(x)}

解答

\int_{0}^{1} 3 e^{- 7 x} d x

解答

- \frac{6 ( - e ^{7} + 8 )}{49 e ^{7}}

+1

十进制

0.12155 \dots

求解步骤

\int_{0}^{1} 3 e^{- 7 x} d x

提出常数:

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

= 3 \cdot \int_{0}^{1} e^{- 7 x} d x

使用换元积分法

= 3 \cdot \int_{0}^{1} e^{- 7 u} \cdot 2 u d u

提出常数:

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

= 3 \cdot 2 \cdot \int_{0}^{1} e^{- 7 u} u d u

使用换元积分法

= 3 \cdot 2 \cdot \int_{0}^{- 7} \frac{e ^{v} v}{49} d v

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

= 3 \cdot 2 (- \int_{- 7}^{0} \frac{e ^{v} v}{49} d v)

提出常数:

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

= 3 \cdot 2 (- \frac{1}{49} \cdot \int_{- 7}^{0} e^{v} v d v)

使用分布积分法

= 3 \cdot 2 (- \frac{1}{49} [e^{v} v - \int e^{v} d v]_{- 7}^{0})

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

= 3 \cdot 2 (- \frac{1}{49} [e^{v} v - e^{v}]_{- 7}^{0})

化简

3 \cdot 2 (- \frac{1}{49} [e^{v} v - e^{v}]_{- 7}^{0}) : - \frac{6}{49} [e^{v} v - e^{v}]_{- 7}^{0}

= - \frac{6}{49} [e^{v} v - e^{v}]_{- 7}^{0}

带入上下限计算后得:

- 1 + \frac{8}{e ^{7}}

= - \frac{6}{49} (- 1 + \frac{8}{e ^{7}})

化简

= - \frac{6 ( - e ^{7} + 8 )}{49 e ^{7}}

作图

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