若3X-2Y+6=0,则13-9X+6Y=?
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
已知x,y满足x²+y²-4x+6y+13=0则(3x+y)²-(3x+y)(3x-y)的
若3X-2Y+6=0,则13-9X+6Y=?
若3X-2Y+6=0,则13-9X+6Y=( ).
已知x,y为实数,根号3x+4 +y^2-6Y+9=0则x+y=?
若x^2+y^2-4x+6y+13=0,则2x+3y的值为
若5x+3y=3x+4y=x+2y+6,则x+y=___
x平方-4x+2y+6y+13=0则x= y=?
已知x-2y=3,则(2x+y-6)/(3x-y-9)=?
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
2 21.(2x+3y) -(x+2y) 2 2 2 22.3|x-3|+x -6xy+9y =0 则x y+2xy=?