(x^2+y^2)/(x^2-xy+y^2)=2,求x/y
x根号x+x根号y/xy-y^2)-(x+根号xy+y/x根号x-y根号)y
已知xy=2,x-y=3,求(x+y)(x-y)-y^2-(6x^2y-2xy^2)/2y的值.
已知xy=-2,x-y=3,求(x+y)(x-y)-y平方+(x-y)平方-(6x2y-2xy平方)/2y的值
正数x,y满足x^2-y^2=2xy,求(x-y)/(x+y)的值
(1)正数x,y满足x^2-y^2=2xy,求(x-y)/(x+y)
2x²-3xy=y²=0(x,y不得o)求x/y+y/x
已知x^2+xy-2y^2=0 (x不等于0,y不等于0),求x/y-y/x-(x^2+y^2)/xy的值
初中数学分式已知x/y=2,求(x*x-xy+3y*y)/x*x+xy+6y*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?
x(x-1)-(x平方-y)=-3,求x平方+y平方-2xy
已知(x+2)^2+|x+y+5|=0,求3x^2y-[2x^2y-(2xy-x^2y)-4x^2]-xy
f(x+y,xy)=x^2+y^2