若|x+3|+|y+2|＝0,求x-y的值?

若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 已知（x-y+3)²+根号2x+y＝0,求x+y的值. 若X大于0求|X-Y+2|-|y-x-3|的值y小于0 若／X+Y-9／+（2X-Y+3)=0求X与Y的值 若|x|＝3,|y|＝2,且|x-y|＝y-x,求x+y的值 若|x|＝3,|y|＝2,且|x-y|＝y-x,求x+y的值 √x+y-3+/xy+x+y-2/＝0,求x÷y+y÷x的值. 若X,Y互为相反数,且(X+Y+3)(X-Y-2)=0,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*y)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(2x-y-1)²+|x-2y-3|=0,求代数式(2x+y)(2x-y)-(x+2y)(x-2y-1)的值 x>0x,y>0,求x-y+2-y-x-3的值 |3X-2Y|+√Y-2Z＝0求X/Y+Y/Z+Z/X的值 若x^2-4x+y^2-10y+29=0,求x^2y^2+2x^3y^2+x^4y^2的值 若x^2-xy-3y^2=0(y>0),求x/y的值 .若|x-y|+|y-3|=0,求2x+y的值. 若(x+y)(x+y-1)-2=0,求x+y的值求 若有理数x.y.z满足等式(x-2)*(x-2)+(2x-y)*(2x-y)*(2x-y)*(2x-y)*+|x-3z|=0,求x+y+z的值 已知x－y＝1,y≠0,求｛(x＋2y)²＋（2x＋y）(x＋4y)－3(x＋y）（x－y)｝÷y的值.