x^2+xy+y^2-3x-3y+3=0
已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+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(2x+y)/(x^2-2xy+y^2)X(x-y)
若2x平方+3xy-2y平方=0,求x+y/x-y
|x+2y+3|+(2x+y)²=0求x²-xy+y²
已知x,y>0 2x+y+3=xy 求5x+4y最小值
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
(-3x^y+2xy)-( )=4x^+xy
(x+y)(x-y)-(2xy+3y)平方