2009（x+y)^2与|x-y-2|/2006的值互为相反数,求 x,y的值 x^2009+y^2006的值

2xy/(x+y)(x+y)与x/(x+y)(x-y)怎么通分 比较(x^2+y^2)(x-y)与(x^2-y^2)(x+y)的大小 2xy/(x+y)^与x/x^-y^ x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 化简y(x+y)+(x+y)(x-y)-x^2 (x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(x-y)^2 【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y) 因式分解x(x+y)(x-y)-x(x+y)^2 说明代数式[(x-y)^2-(x+y)(x-y)] ÷(-2y)+y的值,与y的值无关 说明代数式[(x-y)²-(x+y)(x-y)]÷(-2y)+y的值,与y的值无关 通分x/3y与3x/2y^2 通分x/3y与3x/2y^2 2x-y=0与x+y=10 已知Y=2X,X与Y不成比例. 2x=Y Y与X成?比例 [(x-y)^2-(x+2y)(x-2y)]/y 计算:y-x分之x+y+x-y分之y-y-x分之2x-y 设x>0,y>0,且x≠y,比较(x^2/y^2)+(y^2/x^2)与(x/y)+(y/x)的大小