已知(a+2)=－/a+b+5/,求3a＾2b－[ - 知识问答

已知(a+2)=－/a+b+5/,求3a＾2b－[2a^2b－（2ab－a^2b)－4a^2]－ab的植

1个回答

(a+2)^2=－/a+b+5/,
a=-2
a+b+5=0
b=-3
3a＾2b－[2a^2b－（2ab－a^2b)－4a^2]－ab
=3a^2b-[2a^2b-2ab+a^2b-4a^2]-ab
=3a^2b-3a^2b+2ab+4a^2-ab
=4a^2+ab
=16+6
=22

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