计算 4x²-[2x-(x²-2x+3)-2(x²-3x)] (x²-2xy+y
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计算 4x²-[2x-(x²-2x+3)-2(x²-3x)] (x²-2xy+y
计算:【[2/(3x)-2/(x+y)×[(x+y/(3x)-x²-xy)]】÷(x-y)/x
计算3x/8y×16y²/27x² (2xy-x²)÷x-2y/xy 2x-6/x
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计算: (x+3)(x²-x-2)
计算 (x+3)(x²-x-2)
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)
急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
计算(1)3x/8y×16y²/27x² (2)(2xy-x²)÷x-2y/xy 2x-6
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
x四次方+x³-3x²-4x-4 x(x-1)+y(y+1)-2xy (x-2)³-(y-