右边通分=[A(x+3)+B(x-2)]/(x-2)(x+3)=[(A+B)x+(3A-2B)]/(x-2)(x+3)=(3x+4)/(x-2)(x+3)所以(A+B)x+(3A-2B)=3x+4所以A+B=33A-2B=4所以A=2B=1
3x+4/x²+x-6=A/X-2 + B/X+3=(Ax+3A+Bx-2B)/(x-2)(x+3);A+B=3;3A-2B=4;5A=10;A=2;B=1;