关于不定积分的几道题求下类的不定积分1.∫dx/(x+1)(x-2)2.∫x^2dx/(a^2-x^2)^1/2(a>0)3.∫dx/(x^2+1)^1/34.∫dx/1+(2x)^1/2
问题描述：
关于不定积分的几道题
求下类的不定积分
1.∫dx/(x+1)(x-2)
2.∫x^2dx/(a^2-x^2)^1/2(a>0)
3.∫dx/(x^2+1)^1/3
4.∫dx/1+(2x)^1/2
答
1.∫dx/(x+1)(x-2)=1/3∫[(x+1)/(x+1)(x-2)-(x-2)/(x+1)(x-2)]dx
=1/3∫1/(x-2)dx-1/3∫1/(x+1)dx
=1/3ln┃x-2┃-1/3ln┃x+1┃
=1/3ln┃(x-2)/(x+1)┃
现在都11点半了,真不好意思,我没时间做了