化简2x(x-y﹚-5y﹙y-x﹚+3﹙x-y﹚².其中,x=-1,y=2
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化简2x(x-y﹚-5y﹙y-x﹚+3﹙x-y﹚².其中,x=-1,y=2
化简2x(x-y﹚-5y﹙y-x﹚+3﹙x-y﹚².其中,x=-1,y=2
化简2x(x-y﹚-5y﹙y-x﹚+3﹙x-y﹚².其中,x=-1,y=2
2x(x-y﹚-5y﹙y-x﹚+3﹙x-y﹚²
=2x²-2xy-5y²+5xy+3x²-6xy+3y²
=5x²-3xy-2y²
=(5x+2y)(x-y)
=(-5+4)(-1-2)
=3
原式=(x-y)X(2x+5y﹚+3﹙x-y﹚²
=(x-y)X(2x+5y+3x-3y)
=(x-y)X(5x+2y)
=(-3)X(-1)
=3
化简2x(x-y﹚-5y﹙y-x﹚+3﹙x-y﹚².其中,x=-1,y=2
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