等式碰衫右边笑裤腔=A/(x-1)-B/(2x-1)=[A(2x-1)-B(x-1)]/(x-1)(2x-1)=[(2A-B)x-(A-B)]/(x-1)(2x-1)与等纯册式左边比较,得2A-B=5, A-B=4A=1 B=-3
A=1 B=2