1.已知:5x^2-4xy+y^2-2x+1=0,则(x-y)^2005+__________.

1.已知:5x^2-4xy+y^2-2x+1=0,则(x-y)^2005+__________. 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/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y= 已知5x^2-4xy+y^2+y-2x+1=0,求（x-y）^2005 已知x,y>0 2x+y+3=xy 求5x+4y最小值 已知(x-3)²+|y+5|=0,则xy-y^x=__________ 已知（x+2）^2+|x+y+5|=0,求3x^2y-[2x^2y-(2xy-x^2y)-4x^2]-xy 已知(x+2)^2+|x+y+5|=0,求3x^2y+{-2X^2y-[-2xy+(x^2y-4x^2)]-xy} 已知x²+y²-2x+4y+5=0,求X^4-y^4/2x^2+xy-y²·2x-y/xy 已知x+y=-1,xy=-2,求代数式-5（x+y)+(x-y)+x(xy+y)的值 已知实数x,y满足5x²+2y²+1=6xy+4x-2y,则x²-xy+2000y 已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}