【(3x-2y)^2-(4x+y)(4y-x)】÷3x
x/x-y*y^2/x+y-x^3y2/x^4-y^4/x^2/x^2+y^2
(x+3y-4)(2x-y)
(2x-y)(2x+y)+(2x-y)(y-4x)+2y(y-3x)+2x^4y^2÷(xy)^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
(2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y)
【(3x-2y)^2-(4x+y)(4y-x)】÷3x
(2x-y)(2x+y)-2(3x-4y)(4y+3x)
(x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3)
(x-3y)(y+2x)-(4y-3x)(3x+4y)计算
计算【3(x-y)^2(x+y)^-2/4(x+y)^2(x-y)^-2】^-2
计算(2x-3y)(x+4y)-(3x+y)(x-2y)