2x-7y=8y-2x=32
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
已知实数x.y满足根号(x+y-8)+根号(8-x-y)=根号(3x-y-4)+根号(x-2y+7),求x,y
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
2x-y=7,3x+y=8
[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013
(x+2y)(x-2y)-(2y-x)(-2x-y)其中x=8,y=-8
[(x+2y)(x-2y)-(x-2y)^2+8y(x+y)]除以4x=
已知方程组{2x+y=7,x+2y=8,则x-y=(),x+y=().
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知x+y/y=11/8,求x-y/x+2y的值.