已知(a+2)²+丨b-3丨=0 求 3a²b-(2a平方+a²-2b)
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已知(a+2)²+丨b-3丨=0 求 3a²b-(2a平方+a²-2b)
已知(a+2)²+丨b-3丨=0 求 3a²b-(2a平方+a²-2b)
已知(a+2)²+丨b-3丨=0 求 3a²b-(2a平方+a²-2b)
(a+2)²+丨b-3丨=0
则a+2=0,b-3=0
则a=-2,b=3
3a²b-(2a平方+a²-2b)
=3*4*3-(2*4+4-2*3)
=36-6
=30