如图
∫(x+2)dx/√(5+x-x^2) 解:5+x-x^2=-(x-1/2)^2+21/4原式=-1/2∫(-2x+1)dx/√(5+x-x^2)+5/2∫dx/√(5+x-x^2)=-√(5+x-x^2)+5/2∫dx/√[21/4-(x-1/2)^2]=-√(5+x-x^2)+5/√21arcsin[(x-1/2)/(√21/2)]+C=-√(5+x-x^2)+5/√21arcsin[(2x-1)/√21]+C