求(2a平方+3a+2)/(a+1)-(a平方-4a-5)/(a+2)-(3a平方-4a-5)/(a-2)+(2a平方a-8a+5)/(a-3)

问题描述:

求(2a平方+3a+2)/(a+1)-(a平方-4a-5)/(a+2)-(3a平方-4a-5)/(a-2)+(2a平方a-8a+5)/(a-3)