如果(a+b)的平方+2b-1的绝对值=0,则ab-[2ab-3(ab-1)]
问题描述:
如果(a+b)的平方+2b-1的绝对值=0,则ab-[2ab-3(ab-1)]
答
=-7/2
答
a+b=0
2b-1=0
∴a=-1/2
b=1/2
ab-[2ab-3(ab-1)]
=ab-2ab+3ab-3
=2ab-3
=-1/2-3
=-7/2