x乘以根号下x-2不定积分

问题描述:

x乘以根号下x-2不定积分

令根号x-2=t,则 x=t^2+2 dx=2tdt 原式= =2/5t^5+4/3t^3+C
将 =t,代入,得原式=2/5乘以根号下x-2的五次方+4/3乘以根号下x-2的三次方+C

∫x√(x-2) dx,令u = x-2,du=dx
= ∫(u+2)√u du
= ∫u^(3/2) du + 2∫√u du
= (2/5)u^(5/2) + 2(2/3)u^(3/2) + C
= (2/15)(3x+4)(x-2)^(3/2) + C