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受欢迎的微积分 >

integral of 5/(2x+3)

解答

\int \frac{5}{2 x + 3} d x

解答

\frac{5}{2} ln ∣ 2 x + 3 ∣ + C

求解步骤

\int \frac{5}{2 x + 3} d x

提出常数:

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

= 5 \cdot \int \frac{1}{2 x + 3} d x

使用换元积分法

= 5 \cdot \int \frac{1}{2 u} d u

提出常数:

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

= 5 \cdot \frac{1}{2} \cdot \int \frac{1}{u} d u

使用积分常见定则:

\int \frac{1}{u} d u = ln (∣ u ∣)

= 5 \cdot \frac{1}{2} ln ∣ u ∣

u = 2 x + 3

代回

= 5 \cdot \frac{1}{2} ln ∣ 2 x + 3 ∣

化简

5 \cdot \frac{1}{2} ln ∣ 2 x + 3 ∣ : \frac{5}{2} ln ∣ 2 x + 3 ∣

= \frac{5}{2} ln ∣ 2 x + 3 ∣

解答补常数

= \frac{5}{2} ln ∣ 2 x + 3 ∣ + C

作图

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