(-a+15)²+|-12-b|=0,求-a-b+7的值
问题描述:
(-a+15)²+|-12-b|=0,求-a-b+7的值
答
(-a+15)²+|-12-b|=0
那么-a+15=0 -12-b=0
a=15 b= -12
-a-b+7
= -15+12+7
=4