合并多项式:5(x-y)²-(x-y)-8(x-y)²-3(x-y)

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合并多项式:5(x-y)²-(x-y)-8(x-y)²-3(x-y)

合并多项式:5(x-y)²-(x-y)-8(x-y)²-3(x-y)
合并多项式:5(x-y)²-(x-y)-8(x-y)²-3(x-y)

合并多项式:5(x-y)²-(x-y)-8(x-y)²-3(x-y)
5(x-y)²-(x-y)-8(x-y)²-3(x-y)
=[5(x-y)²-8(x-y)²]-[(x-y)+3(x-y)]
=-3(x-y)²-4(x-y)

5(x-y)²-(x-y)-8(x-y)²-3(x-y)
=(5-8)(x-y)^2+(-1-3)(x-y)
=-3(x-y)^2-4(x-y)