已知未知数xy满足x^2+y^2+2x-4y+5=0,求xy的值
已知X+Y=2XY,求4X-5XY+4Y 除以X+XY+Y 的值
已知xy满足x^2+y^2+4/5=2x+y 求代数式yx/x+y的值
已知实数xy满足x^2+y^2-6x+4y+13=0求x^y的值
若x,y满足x^+2y^-2xy+1=0,求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?
已知xy^2=-2,求-xy(x^2y^5-xy^3-y)的值.
已知实数x,y满足5x^2-3xy+1\2y^2-2x+1\2y+1\4=0,求x,y的值
已知实数x、y满足5x²-3xy+1/2y²-2x+1/2y+1/4=0 求x、y的值
已知x,y满足x^2+y^2-2x-y+5/4=0,求代数式xy(x+y)的值
已知xy为实数,且满足2x^2+4xy+4y^2+8x+12y+10=0,试求x+y的值
已知x-y=4xy,求x-2xy-y分之2x+3xy-2y的值!
已知xy/x+y=2,求代数式3x-5xy+3y/-x+2xy-y的值