/x/=8./y/=6求x+y的值若/x/=3/y/=5丨x丨=8,丨y丨=6,求x+y的值;若丨x丨=3,/y/ =5,且丨x-y丨=y-x,再求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 若x-y=1,求代数式x(x-y)+y(y-x)+2013的值 x,y 满足x(x-2)-y(y-6)=-10,求x,y的值 已知x+y=6,xy=7,试求x*x+y*y,x*x-y*y的值 若x,y是正整数,且满足x(x+y)-y(x+y)=11求x+y的值 若x、y为正整数,且满足x(x+y)-y(x+y)=11,求x,y的值 x*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值 若X平方-Y平方=12,X+Y=6,求X,Y的值 若x²-y²=6,x+y=3,求x-y的值. 若x+y=6,xy=2.75,x-y>0,求x-y的值 若（x+y）(x+y-1)=6,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x^2+y^2-10x-6y+34=0,求（x-y)/(x+y)的值 若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值 (-x+6):(x-y);(4x+y)=3;14:1,求x+y的值. 已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值 x+x+x+y+y=54 x+x+y+y+y=56 求y的值 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值