(-a+15)²+|-12-b|=0,求-a-b+7的值
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(-a+15)²+|-12-b|=0,求-a-b+7的值
(-a+15)²+|-12-b|=0,求-a-b+7的值
(-a+15)²+|-12-b|=0,求-a-b+7的值
(-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