2x+3y-1=y-x-8=x+6,则x=
2x+3y-1=y-x-8=x+6,则x=
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1
若X+6=Y-X-8=2X-3Y-1,则3X-Y=?
若2X+3Y-1=Y-X-8=X+6则2X+Y=
若2x+3y-1=y-x-8=x+6,则2x-y=______.
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
9y=3x-(x-1),4(x+y)-(2x+4)=8y
2x+3y-1=y-x-8=x+6 ,y=?