化简求值(x+y)(x-y)-(x-y)²-6x²y/2y+(2xy)&#178

发布时间：2021-03-15 05:26:31

化简求值(x+y)(x-y)-(x-y)²-6x²y/2y+(2xy)²/(-4xy)其中x=-2,y=1/3

网友回答

(x+y)(x-y)-(x-y)²-6x²y/2y+(2xy)²/(-4xy)=x²-y²-x²+2xy-y²-3x²-xy=-3x²-2y²+xy当x=-2,y=1/3时原式=-12-2/9-2/3=-12又8/9
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