/x-7/+/y+3/=0求x+y的值

已知|3x-y|+|x+y|=0,求x-y除以x*y的值. 已知x、y满足二分之一|x-y|+|1-y|=0,求7x-3y的值. 已知x、y满足二分之一,｜x-y｜+｜1-y｜=0,求7x-3y的值 已知x、y满足2/1|x-y|+|1-y|=0,求7x-3y的值 已知：x,y满足|2x-y|+|y-1/2|=0,求7x-3y的值. 以知x,y满足1/2[x-y]+[1-y]=0,求7x-3y的值 已知2x-y/7x+5y=2/3且y≠0,求x/y的值 已知x-y不等于0,x^2-x=7,y^2-y=7,求x^3+y^3+x^2y+xy^2的值 已知X-Y不等于0,X^2-X=7,Y^2-Y=7,求X^3+Y^3+X^2Y+XY^2的值 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值 已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值 x-y=3 7-x+y-y平方+X平方已知x-y=3 求代数式7-X+y-(y-x)²的值 已知(3x+1)(3x-3)-3x+2)^2=-7,(y+7)(y-7)-y(y-7)=0,求8y^2-5y(-y+3x)+4y(-4y-5/2x)的值 已知（x+y）2 =2,(x-y)3 =3,求(x+y)7(x-y)2(x+y)3(y-x)4 的值 y=3(x-y),x=2(x-y)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,求代数式7-x+y-(y-x)的平方的值 已知x-3y=0,求（2x+y)/(x^2-2xy+y^2)*(x-y)的值已知x-3y=0,求（2x+y)/(x^2-2xy+y^2)*(x-y)的值