已知等式(3x-1)/(x-2)(x+3)=A/(x+3)+B/(x-2),它对一切x值都成立,求A、B的值.

问题描述:

已知等式(3x-1)/(x-2)(x+3)=A/(x+3)+B/(x-2),它对一切x值都成立,求A、B的值.

(3x-1)/(x-2)(x+3)=A/(x+3)+B/(x-2),
3x-1=A(x-2)+B(x+3)
3x-1=(A+B)x+(3B-2A)
A+B=3
3B-2A=-1
A=2
B=1