问题 填空题 已知:2x-3(x-1)(x+2)=Ax-1+Bx+2,则A=______,B=______. 答案 2x-3(x-1)(x+2)=Ax-1+Bx+2=A(x+2)+B(x-1)(x-1)(x+2)=(A+B)x+2A-B(x-1)(x+2)∴A+B=22A-B=-3解得A=-13B=73.