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3(a^2-2ab)-2(-3ab-b^2)
3a^2-[a^2+(4a^2-2a)-2(a^2-3a_]
人气:160 ℃ 时间:2020-03-28 10:14:53
解答
3(a²-2ab)-2(-3ab-b²) =3a²-6ab+6ab+2b² =3a²+2b² 3a²-[a²+(4a²-2a)-2(a²-3a_] =3a²-[a²+4a²-2a-2a²+6a] =3a²-a²-4a²+2a+2...
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