已知:3a-b+1的绝对值+(2a-b)^2=0,求(b^2/a+b)*(ab/a+b)的值

问题描述:

已知:3a-b+1的绝对值+(2a-b)^2=0,求(b^2/a+b)*(ab/a+b)的值

3a-b+1=0
2a-b=0
则a=-1,b=-2
[b^2/(a-b)]/{[b/(a-b)][ab/(a+b)]}
=[b^2/(a-b)][(a-b)^2/(ab^2)]
=(a-b)/a
=(-1+2)/(-1)
=-1