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受欢迎的微积分 >

integral of 1/(1+sqrt(2x+3))

解答

\int \frac{1}{1 + 2 x + 3} d x

解答

1 + 2 x + 3 - ln 1 + 2 x + 3 + C

求解步骤

\int \frac{1}{1 + 2 x + 3} d x

使用换元积分法

= \int \frac{1}{2 ( 1 + u )} d u

提出常数:

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

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

使用换元积分法

= \frac{1}{2} \cdot \int \frac{2 ( v - 1 )}{v} d v

提出常数:

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

= \frac{1}{2} \cdot 2 \cdot \int \frac{v - 1}{v} d v

乘开

\frac{v - 1}{v} : 1 - \frac{1}{v}

= \frac{1}{2} \cdot 2 \cdot \int 1 - \frac{1}{v} d v

使用积分加法定则:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= \frac{1}{2} \cdot 2 (\int 1 d v - \int \frac{1}{v} d v)

\int 1 d v = v

\int \frac{1}{v} d v = ln ∣ v ∣

= \frac{1}{2} \cdot 2 (v - ln ∣ v ∣)

代回

= \frac{1}{2} \cdot 2 (1 + 2 x + 3 - ln 1 + 2 x + 3)

化简

\frac{1}{2} \cdot 2 (1 + 2 x + 3 - ln 1 + 2 x + 3) : 1 + 2 x + 3 - ln 1 + 2 x + 3

= 1 + 2 x + 3 - ln 1 + 2 x + 3

解答补常数

= 1 + 2 x + 3 - ln 1 + 2 x + 3 + C

作图

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