integral of x/(sqrt(2x-3))

解答

\int \frac{x}{2 x - 3} d x

\frac{1}{3} (x + 3) 2 x - 3 + C

求解步骤

\int \frac{x}{2 x - 3} d x

使用换元积分法

= \int \frac{u ^{2} + 3}{2} 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 u^{2} + 3 d u

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} (\int u^{2} d u + \int 3 d u)

\int u^{2} d u = \frac{u ^{3}}{3}

\int 3 d u = 3 u

= \frac{1}{2} (\frac{u ^{3}}{3} + 3 u)

u = 2 x - 3

代回

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

化简

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

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

解答补常数

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

\int (x^{2} + 3 x)^{2} d x

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