-3(2x−y)−2(4x+12y)+2009
(x+3y-4)(2x-y)
x/x-y*y^2/x+y-x^3y2/x^4-y^4/x^2/x^2+y^2
已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y除以2x-y
已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值
化简(x+y)-(2x+y/2)-(3x+y/6)-(4x+y/12)-(5x+y/20)-……-(10x+y/90)
(2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y)
已知x=3分之一,y=-2分之一,求代数式x-(x+y)+(x+2Y)-(x+3y)+(x+4y)...-(x+2009
已知实数x,y满足2x+y−2≥0x−2y+4≥03x−y−3≤0则x
(2x-y)(2x+y)-2(3x-4y)(4y+3x)
计算【3(x-y)^2(x+y)^-2/4(x+y)^2(x-y)^-2】^-2
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
(x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3)