若|x-y|+|2x-4|=2x-4且|x+y-1|=0求x,

若x^5+x^4y+x^4+x+y+1=0,且3x+2y=1,求x,y的值 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* 若|x+2y-1|+y²+4y+4=0,求（2x-y）²-2（2x-y)(x+2y)+(x+2y)& 已知4x=9y求(1)x+y/y (2)y-x/2x 若x^2-3x+1=0 y^2-3y+1=0 且 x不等于y 求x^4+y^4的值 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 若x,y为实数,且y=根号1-4x+根号4x-1+2/1 ·求根号x/y+2+y/x-根号x/y-2+y/x= x>0y>0且1/x+9/y=1求2x+y最小值 已知5x-4y=0且xy不等于0,求x^2+y^2/x^2-y^2-x+y/x-y的值 已知|x|=4,|y|=1/2,且x+y＜0,求x/y的值 若X,Y互为相反数,且(X+Y+3)(X-Y-2)=0,求X,Y的值?