若x>y>1 ,0

若实数x,y满足x-y+1》=0,x+y>=0,x 若实数x,y满足x-y+1>=0,x+y>=0,x 若|x+y-1|+（x-y-2)²=0,求代数式（x+2y)(x-2y）-（2x-y)(-y-2x)的值. 若x+y=1,x不等于0则x+(2xy+y^2)/x/(x+y)/x= 若x>y>1 ,0 证明：若x>0,y>0,x+y=1,则（x+1/x)(y+1/y)≥25/4 若x,y满足约束条件,x>=0,y>=0,x-y>=-1,3x+4y 若x,y满足|x-y+1|+(x+y+3)^2=0则x^2-y^2= 若x,y满足|2x-y-3|+|3x+2y+1|=0,则x= y= 若x>0,y>0,求(x+y)(1/x+4/y)的最小值 若x大于y大于0,（y+1分之x+1)-x分之y＝（） 若（x+y)(1-x-y)+6=0,则x+y的值是_____ 若|x+y+1|+(x-2y)的平方=0,则x+2y=? 若(x+y)(x+y-1)-2=0,求x+y的值求 若|x+y-5|+(x-y+1)²=0,则x²-y²= 若(2x-y-1)2+|x-2y-3|=0,求代数式(2x+y)(2x-y)-(x+2y)(x-2y-1)的值若(2x-y-1)²+|x-2y-3|=0,求代数式(2x+y)(2x-y)-(x+2y)(x-2y-1)的值 若x＞1,y＞0,且满足 xy=x^y,x/y大于等于x^3y,则y则 最大值求y 的最大值 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7