计算:(1)-4x²y+2x²y+5y²x-2xy²(2)7-3x-4x²+4x-8x²-15,其中x=1/2
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计算:(1)-4x²y+2x²y+5y²x-2xy²(2)7-3x-4x²+4x-8x²-15,其中x=1/2
计算:(1)-4x²y+2x²y+5y²x-2xy²(2)7-3x-4x²+4x-8x²-15,其中x=1/2
计算:(1)-4x²y+2x²y+5y²x-2xy²(2)7-3x-4x²+4x-8x²-15,其中x=1/2
(1)-4x²y+2x²y+5y²x-2xy²
=-2x²y+3xy²
=xy(-2x+3y);
(2)7-3x-4x²+4x-8x²-15,其中x=1/2
=-12x²+x-8
=-12×1/4+1/2-8
=-3-8+1/2
=-10又2分之1;
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