5x²-4xy+y²-2x+1=0,求(x-y)2010
已知x²+y²-2x+4y+5=0,求X^4-y^4/2x^2+xy-y²·2x-y/xy
已知X²+Y²+X²Y²-4XY+1=0 求:(X-Y)^2008-(XY)^2
实数x y满足x≥y≥1和2x²-xy-5x+y+4=0求x+y之值
2x+y=0,求4x²+2xy(x+y)+y³
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
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
求x²+y²-2x+4y+1的最小值 求x,y的值 x²+2xy+4x-12y+22=0
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/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*
1/x+1/y=5,求2x-3xy+2y/x²+xy+y的值
x²+y²-2x-4y+5=0,求½(x-1)²-xy的值