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受欢迎的微积分 >

integral of (8x+10)/((x^2-2x+2)^{3/2)}

解答

\int \frac{8 x + 10}{( x ^{2} - 2 x + 2 ) ^{\frac{3}{2}}} d x

解答

- \frac{8}{( x ^{2} - 2 x + 2 ) ^{\frac{1}{2}}} + \frac{18 ( x - 1 )}{( x ^{2} - 2 x + 2 ) ^{\frac{1}{2}}} + C

求解步骤

\int \frac{8 x + 10}{( x ^{2} - 2 x + 2 ) ^{\frac{3}{2}}} d x

对

x^{2} - 2 x + 2

配方:

(x - 1)^{2} + 1

= \int \frac{8 x + 10}{( ( x - 1 ) ^{2} + 1 ) ^{\frac{3}{2}}} d x

使用换元积分法

= \int \frac{8 u + 18}{( u ^{2} + 1 ) ^{\frac{3}{2}}} d u

乘开

\frac{8 u + 18}{( u ^{2} + 1 ) ^{\frac{3}{2}}} : \frac{8 u}{( u ^{2} + 1 ) ^{\frac{3}{2}}} + \frac{18}{( u ^{2} + 1 ) ^{\frac{3}{2}}}

= \int \frac{8 u}{( u ^{2} + 1 ) ^{\frac{3}{2}}} + \frac{18}{( u ^{2} + 1 ) ^{\frac{3}{2}}} 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

= \int \frac{8 u}{( u ^{2} + 1 ) ^{\frac{3}{2}}} d u + \int \frac{18}{( u ^{2} + 1 ) ^{\frac{3}{2}}} d u

\int \frac{8 u}{( u ^{2} + 1 ) ^{\frac{3}{2}}} d u = - \frac{8}{( u ^{2} + 1 ) ^{\frac{1}{2}}}

\int \frac{18}{( u ^{2} + 1 ) ^{\frac{3}{2}}} d u = \frac{18 u}{( 1 + u ^{2} ) ^{\frac{1}{2}}}

= - \frac{8}{( u ^{2} + 1 ) ^{\frac{1}{2}}} + \frac{18 u}{( 1 + u ^{2} ) ^{\frac{1}{2}}}

u = x - 1

代回

= - \frac{8}{( ( x - 1 ) ^{2} + 1 ) ^{\frac{1}{2}}} + \frac{18 ( x - 1 )}{( 1 + ( x - 1 ) ^{2} ) ^{\frac{1}{2}}}

化简

- \frac{8}{( ( x - 1 ) ^{2} + 1 ) ^{\frac{1}{2}}} + \frac{18 ( x - 1 )}{( 1 + ( x - 1 ) ^{2} ) ^{\frac{1}{2}}} : - \frac{8}{( x ^{2} - 2 x + 2 ) ^{\frac{1}{2}}} + \frac{18 ( x - 1 )}{( x ^{2} - 2 x + 2 ) ^{\frac{1}{2}}}

= - \frac{8}{( x ^{2} - 2 x + 2 ) ^{\frac{1}{2}}} + \frac{18 ( x - 1 )}{( x ^{2} - 2 x + 2 ) ^{\frac{1}{2}}}

解答补常数

= - \frac{8}{( x ^{2} - 2 x + 2 ) ^{\frac{1}{2}}} + \frac{18 ( x - 1 )}{( x ^{2} - 2 x + 2 ) ^{\frac{1}{2}}} + C

作图

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