(x² 1)½dx²的不定积分-搜答案-智慧作业帮

∫ln(1-√x)dx=xln(1-√x)+(1/2)∫√x/(1-√x)dx=xln(1-√x)-(1/2)∫(1-√x-1)/(1-√x)dx=xln(1-√x)-(1/2)x+(1/2)∫1/(

∫dx/[x+x^(n+1)]=∫dx/[x(1+x^n)]=∫[(1+x^n)-x^n]dx/[x(1+x^n)]=∫dx/x-∫x^(n-1)dx/(1+x^n)=lnx-x^n/n!+C再问：最

再答：再答：两张一样的

∫ln(x+√(1+x^2))dx=xln(x+√(1+x^2)-∫xd(ln(x+√(1+x^2))[ln(x+√1+x^2)]'=[1+x/√(1+x^2)]/(x+√(1+x^2))=1/√(1

∫dx/(x²+2x+5)=∫d(x+1)/[(x+1)²+4]=(1/2)arctan[(x+1)/2]+C

令√x=tx=t方,dx=2tdt所以原式=∫2tdt/[(1+t方)t]=2∫1/(1+t方)dt=2arctant+c=2arctan√x+c

∫(x+1)e∧xdx=∫(x+1)de∧x=(x+1)e∧x-∫e∧xd(x+1)=(x+1)e∧x-e∧x=xe∧x

答：设t=√x,x=t^2∫[1/(√x+x)]dx=∫[1/(t+t^2)]d(t^2)=∫[1/(t+t^2)]2tdt=2∫[1/(1+t)]d(t+1)=2ln(t+1)+C=2ln(√x+1

答：∫[x/(1-x)]dx=∫[(x-1+1)/(1-x)]dx=∫[-1+1/(1-x)]dx=-∫dx-∫[1/(x-1)]d(x-1)=-x-ln|x-1|+C

用第一换元法即可……设u=e^x,则du=e^xdx,积分即可化为∫du/(1-u^2)=-1/2ln|(u-1)/(u+1)|=-1/2ln|(e^x-1)/(e^x+1)|

见图

（1）∫dx/(1+√x)=∫2√xd(√x)/(1+√x)=2∫[1-1/(1+√x)]d(√x)=2[√x-ln(1+√x)]+C(C是积分常数)（2）∫[(1+lnx)/(xlnx)²

=-1/(xlnx)-∫dx/(x2;lnx)∫dx/(x2;lnx)C(提示：在上式第一个积分应用分部积分,C是积分常数)=-1/(xlnx).

1/[x^2(1-x)]=A/(x-1)+B/x+C/x^2Ax^2+Bx(x-1)+C(x-1)=-1x=0:C=1x=1:A=-1x=-1:A+2B-2C=-1B=1∫dx/[x^2(1-x)]=

看图片：\x0d\x0d

∫1/(x方-1)dx=∫1/(x-1)(x+1)dx=1/2∫[1/(x-1)-1/(x+1)]dx=1/2[ln|x-1|-ln|x+1|]+c=1/2ln|(x-1)/(x+1)|+c

∫dx/(x^2+x)=∫[1/x-1/(x+1)]dx=ln|x/(x+1)|+C