1 (x^2 2X-8)的不定积分-搜答案-大师作文网

§dx/[x(lnx-1)]=§dlnx/(lnx-1)=§dlnln(x-1)=lnln(x-1)

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

ln(x+1)的不定积分?

原式=∫ln(x+1)d(x+1)=(x+1)ln(x+1)-∫(x+1)dln(x+1)=(x+1)ln(x+1)-∫(x+1)*1/(x+1)d(x+1)=(x+1)ln(x+1)-∫dx=(x+

sinx/x的不定积分

那肯定是你做错了哈哈哈∫sinx/xdx=∫-1/xdcosx=-cosx/x-∫cosx/x²dx做不到∫sinx/xdx=x*sinx/x-∫x*(xcosx-sinx)/x²

答：1.∫arcsinxdx可用分部积分原式=xarcsinx-∫x/√(1-x^2)dx=xarcsinx+√(1-x^2)+C2.∫e^(√x+1)dx换元,令√(x+1)=t,则x=t^2-1,

=∫x^2/x^2+1dx=∫(x^2+1-1)/x^2+1dx=∫1-(1/x^2+1)dx=x-arctanx+c

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

我尽力做,你自己验算下吧

求不定积分1.∫[(1/x)√(x–1)]dx令√(x–1)=u,则x-1=u²,x=u²+1；dx=2udu；代入原式得：原式=2∫u²du/(u²+1)=2

1/(x+1)(x+2)(x+3)=1/(x+1)[1/(x+2)-1/(x+3)]=1/[(x+1)(x+2)]-1/[(x+1)(x+3)]=1/(x+1)-1/(x+2)-1/2[1/(x+1)

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拆项计算

x/(x^3+8)=x/[(x+2)(x^2-2x+4)]=A/(x+2)+(Bx+C)/(x^2-2x+4),A=-1/6,B=1/6,C=1/3.x/(x^3+8)=(-1/6)(1/(x+2))

1/(1+x^2)d(1+x^2)=ln(1+x^2)+C

∫［（x－1）/（x^2＋3）］dx＝∫［x/（x^2＋3）］dx－∫［1/（x^2＋3）］dx＝（1/2）∫［1/（x^2＋3）］d（x^2＋3）－（1/√3）∫｛1/［（x/√3）^2＋1］｝d（

3次分部积分法解用!代表积分号=!(x^3-x+1)（1-cos2x）/2dx=(x^3-x+1)（x/2-sin2x/4）-!(3x^2-1)（x/2-sin2x/4）dx+c=-!(3x^2-1)