诺x、y的值满足3x-y=7,2x+3y=1,y=kx+9,则k的值等于_______

若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值 已知：x,y满足|2x-y|+|y-1/2|=0,求7x-3y的值. 已知x、y满足2/1|x-y|+|1-y|=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X,Y满足|X-Y-1|+（X+Y-3)^2=0求X,Y的值 x,y 满足x(x-2)-y(y-6)=-10,求x,y的值 正数x,y满足x-y=2xy,求x-y/x+y的值. 求满足5x+3y=x+2y=7的x,y的值 化简求值：已知x、y满足：x^2+y^2-4x+6y+13=0 求代数式 的值.(3x+y)^2-3(3x-y)(x+y)-(x-3y)(x+3y)急用！ 已知x、y均为实数,且满足xy+x+y=17,x^2y+y^2x=66,求x^4+x^3y+x^2*y^2+y^3x+y^4的值 变量x,y满足约束条件,x+y>=3,x-y>=-1,2x-y 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 诺x、y的值满足3x-y=7,2x+3y=1,y=kx+9,则k的值等于_______ 已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值 已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值 当x,y满足----时,2(x+y)/3(x+y)的值为2/3 实数x.y满足(x-2(平方)+y(平方)=3则y/x的最大值?