a=3 b=-1
5ab²-[2a²b-(4ab²-2a²b)]
= 5*3*1-[2*9*(-1)-(4*3*1+2*9)]
=15-[-18-12-18]
=15+18+12+18
=63
a=3,b=-1,你自己接下去算
由题意,得:
a=3,b=-1
所以,原式=63
因为 |a-3|+(b+1)²=0
又|a-3|大于等于0,(b+1)²大于等于0
所以|a-3|=0,(b+1)²=0
则a=3,b= -1
所以答案=15-[-18-(12+18)]=63
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