(5x+5)/(x^2+x-6)=A/(x-2)+B/(x-3).求A、B的值

问题描述:

(5x+5)/(x^2+x-6)=A/(x-2)+B/(x-3).求A、B的值

(5x+5)/(x^2+x-6)=A/(x-2)+B/(x-3).
(5x+5)=(x-3)A+(x-2)B
A+B=5
-3A-2B=5
A=-15
B=20