5x^2+2y^2+2xy-14x-10y+17=0,则x=( ),y=( )
{x,xy,lg(xy)}={0,|x|,y} 则log8(X^2+Y^2)
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
7.X*X+2X+Y*Y-6Y+10=0,则xy=?
设f(x+y,xy)=x^2+y^2,则f(x,y)
若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知(x+3)+丨X-y+10丨=0 ,求5x²y-[2x²y-(3xy-xy²)-3x&
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
2x²-3xy=y²=0(x,y不得o)求x/y+y/x
已知x^2+y^2-4x+6y+13=0求(xy+y^2/5x^2-5xy+xy+y^2)·(5/x+y)-(y/x-y
[-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y-