若x＞0x,y＜0,求|x-y+2|-|y-x-3|的值

若x＞0x,y＜0,求|x-y+2|-|y-x-3|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*y)的值 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)(x+y-1)-2=0,求x+y的值求 已知:3x-5y=0,求x/y,x-y/y,x-y/x 若根号x+y-3+绝对值xy+x+y-2=0,求x/y+y/x根号x+y-3+绝对值xy+x+y-2=0,求x/y+y/x x＞0y＞0 x+y+xy=2求x+y的最小值 若X大于0求|X-Y+2|-|y-x-3|的值y小于0 若x大于0,y小于0,求|x-y+2|-|y-x-3| 若x+y+3=0,求2/3-2x-2y+(-x-y)^2 求y=(x^2)+2x(x≥0) y=-x+2x(x 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 若2x-3y=0,求5x+4y/3x-2y 若x^2+y^2-6x+4y+13=0 求x+y 因式分解 若 x^2+4x+y^2-6y+13=0 求y^x 若x²+2x+y²-6y+10=0求x y 若x+y－4x－2y＝0,求x+y最大值 若正整数X,Y满足2X+Y--XY=0,求X+Y的最小值