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受欢迎的微积分 >

integral from-4 to 2 of (2x)/(3x^2+10)

解答

\int_{- 4}^{2} \frac{2 x}{3 x ^{2} + 10} d x

解答

- \frac{1}{3} ln (\frac{29}{11})

+1

十进制

- 0.32313 \dots

求解步骤

\int_{- 4}^{2} \frac{2 x}{3 x ^{2} + 10} d x

提出常数:

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

= 2 \cdot \int_{- 4}^{2} \frac{x}{3 x ^{2} + 10} d x

使用换元积分法

= 2 \cdot \int_{58}^{22} \frac{1}{6 u} d u

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

= 2 (- \int_{22}^{58} \frac{1}{6 u} d u)

提出常数:

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

= 2 (- \frac{1}{6} \cdot \int_{22}^{58} \frac{1}{u} d u)

使用积分常见定则:

\int \frac{1}{u} d u = ln (∣ u ∣)

= 2 (- \frac{1}{6} [ln ∣ u ∣]_{22}^{58})

化简

2 (- \frac{1}{6} [ln ∣ u ∣]_{22}^{58}) : - \frac{1}{3} [ln ∣ u ∣]_{22}^{58}

= - \frac{1}{3} [ln ∣ u ∣]_{22}^{58}

带入上下限计算后得:

ln (58) - ln (22)

= - \frac{1}{3} (ln (58) - ln (22))

化简

= - \frac{1}{3} ln (\frac{29}{11})

作图

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