已知(a+2)方,+a+b+5的绝对值=0,求3a方b-[2a方b-(2ab-a方b)-4a方]-ab的值.

2025-01-04 00:51:05
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回答1:

a+2=0
a+b+5=0
∴a=-2
b=-3

3a方b-[2a方b-(2ab-a方b)-4a方]-ab
=3a²b-2a²b+2ab-a²b+4a²-ab
=ab+4a²
=6+16
=22