january123
幼苗
共回答了18个问题采纳率:88.9% 举报
(a+2)²+丨a+b+5丨=0,
(a+2)²=0,丨a+b+5丨=0
a=-2,
丨-2+b+5丨=0
丨b+3丨=0
b=-3
3a²b-[2a²b-(2ab-a²b)-4a²]-ab
=3a²b-[2a²b-2ab+a²b-4a²]-ab
=3a²b-[3a²b-2ab-4a²]-ab
=3a²b-3a²b+2ab+4a²-ab
=ab+4a²
=a(b+4a)
=-2*[-3+4*(-2)]
=-2*(-3-8)
=-2*(-11)
=22
1年前
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