已知[3x-2]2+/2x-y-3/=0求 5[2x-y]-2[6x-2y+2]+[4x-3x-1/2]的值

已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-( 已知x^3+xy^2+x+x^2y+y^3+y=0,求5x-6y/3x+4y的值. 已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y 已知4x-2y=0,求x-y/3x+2y的值 已知3x-4y/2x+y=1/2 求x/y的值 已知|2x-3y|+|3x-y-1|=0,求x,y的值. 1.已知:x-2y=3,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除4x 的值 已知x-2y=2011,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷4x的值. 已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值 (1)已知x+y=6,x²-y²=5,求x-y的值（2）若x+y=3,x²+y² 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?