已知2x-y=4,则7-6x+3y=?
已知x,y为实数,根号3x+4 +y^2-6Y+9=0则x+y=?
已知x,y满足x²+y²-4x+6y+13=0则(3x+y)²-(3x+y)(3x-y)的
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
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
已知x-2y=3,则(2x+y-6)/(3x-y-9)=?
已知x-2y/2x+3y=3/4,则x:y=
已知X和Y满足3X+4Y=2,X-Y-1/7
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
已知{3x+2y=3 2x+3y=7 ,则x+y= ,x-y=
已知2x+y=-6,x-3y=4,在不解方程组的条件下,求7y(x-3y)^2-2(3y-x)^3
已知4x-3y-6y=0,x+2y-7z=0.求x-y+z\x+y+z的值
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y