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2AAB,2AB4

(3a2b-2ab+ab2)-(2a2b-2ab2+7ab) =3a2b-2ab+ab2-2a2b+2ab2-7ab =a+2ab4-9ab 当a=1,b=-2时 =1+2×1×(-2)×4-9×1×(-2) =1+(-16)-(-18) =3 不懂可追问!

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