若x-2y=2,求3x-6y的值
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
当2x-y/x+y=3时,求代数式2x-y/2x+2y+x+y/6x-3y的值.
若x-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y的值
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
当2x-y/x+y=3时,求代数式2x-y/6x-3y的值
若X,Y互为相反数,且(X+Y+3)(X-Y-2)=0,求X,Y的值?
若|x-2|+|2y+3x-6|=0,求x,y的值.
若3x^+2y^=6x求x^+y^的最值
若x=2,求(3x^3y+3xy^3-6x^2y^2)/(x^2y^3-x^3y^2)的值
若|5x-2y-3|+(x+6y-11)X(x+6y-11)=0成立,求x,y的值,
若|3x+y+6|+(x+y+2)的二次方=0,求3x+2y的值.
已知xy=2,x-y=3,求(x+y)(x-y)-y^2-(6x^2y-2xy^2)/2y的值.