若x²-4xy+5y²-2y+1=0,求x,y
已知x²+y²-2x+4y+5=0,求X^4-y^4/2x^2+xy-y²·2x-y/xy
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X²+Y²+X²Y²-4XY+1=0 求:(X-Y)^2008-(XY)^2
2x+y=0,求4x²+2xy(x+y)+y³
实数x y满足x≥y≥1和2x²-xy-5x+y+4=0求x+y之值
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y
已知X²+5Y²-4XY+2Y+1=0求2X-Y的值
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
4/X+1/Y=2,XY=-1,求代数式4Y-X/X-2Y/(x+2y-12Y²/x-2y)的值
若x=1/2,y=1 求x(x²+xy+y²)-y(x²+xy+y²)+3xy(