(一2x^3y^3)^2(-3x^2y)^3÷(-1/2x^5y^4)
(x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3)
求解;一 (x-8y)(x-y) 二 (Y+2)(Y-2)-(Y-1)(Y+5) 三 (3X+4)(3X-4)-(2X+
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先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
数学(x-y)^5*(y-x)^3*(x-y)^2
数学题……555{(3x+y)(3x-y)-(x-5y)(5x-y)-(x-2y)²÷(-4x),x=-2.y
[(x+2y)²-(x+y)(3x-y)-5y²]÷(2x),其中x,y满足x²+4x+y
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
[(x+2y)^2 -(x+y)(3x-y)-5y^2]÷2x
一、 (x-y)^5÷(y-x)^2-(x-y) 二、 先化简,后求值 (2x-y)^13-[(2x-y)^3]-[(y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1