x^2y^2-20xy+x^2+y^2+81=0求x+y的值 谢叻
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方
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
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值
已知:x-xy=40,xy-y=-20,求代数式x-y和x+y-2xy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-y)的值
已知x-3y=0,求(2x+y)/(x^2-2xy+y^2)*(x-y)的值.
已知x-3y=0,求(2x+y)(x-y)/x^2-2xy+y^2的值
已知x-3y=0,求2x+y/x-2xy+y乘(x-y)的值