若x^2+y^2+2x-8y+17=0,求 x^2009+xy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
已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方
若x,y满足x^+2y^-2xy+1=0,求xy的值
已知x-xy=8,xy-y=-9,求x+y-2xy的值
若(y-x)/xy=3,求分式(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
如果x^2+xy+y-14,y^@+xy+x=28,求x+y的值.
x-y-x平方+2xy-y平方+2=0,求x-y的值
2x+8y-xy=0(x>0,y>0),求x+y的最小值
若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值