化简求值:(x²-2y²)(x+2y)-2xy(x-y)其中x=-2,y=-½

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化简求值:(x²-2y²)(x+2y)-2xy(x-y)其中x=-2,y=-½
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化简求值:(x²-2y²)(x+2y)-2xy(x-y)其中x=-2,y=-½
化简求值:(x²-2y²)(x+2y)-2xy(x-y)其中x=-2,y=-½

化简求值:(x²-2y²)(x+2y)-2xy(x-y)其中x=-2,y=-½
数学之美团为你解答
原式 = (x³+2x²y-2xy²-4y³) - 2x²y+2xy²
= x³ - 4y³
= (-2)³ - 4×(-1/2)³
= - 15/2

  1. 原式=-21/2+3=-15/2