化简求值:[(x+y)²-(x+y)(x+3y)-5y²,其中x=-2,y=1/2
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化简求值:[(x+y)²-(x+y)(x+3y)-5y²,其中x=-2,y=1/2
化简求值:[(x+y)²-(x+y)(x+3y)-5y²,其中x=-2,y=1/2
化简求值:[(x+y)²-(x+y)(x+3y)-5y²,其中x=-2,y=1/2
化简可得到-2xy代入的2