若x²+xy-2x+y=0,y²+xy+x-2y=0,求x+y的值
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值
若x+2y=0,xy不等于0,求分式x²+2xy/xy+y²的值
已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方
若x²+xy-2x+y=0,y²+xy+x-2y=0,求x+y的值
已知y-x-2xy=0,求3x+xy-3y/y-xy-x的值
已知y-x-2xy=0,求(3x+xy-3y)\(y-xy-x)的值
已知x-3y=0,求(x²-2xy+y²/x-y)-2y的值
若正数x,y满足x²-y²=2xy,求(x-y)/(x+y)的值
若x,y满足x^+2y^-2xy+1=0,求xy的值
已知x²-7xy+12y²=0求x²-xy+y²/2xy的值
已知x-3y=0,求2x+y/x²-2xy ×(x-y)的值