若x、y的值满足3x-y-7=0,2x+3y=1,y=kx+9,则k的值应等于

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 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满足|X-Y-1|+（X+Y-3)^2=0求X,Y的值 若实数x.y满足√x-y+|y+3|=0,求y的x方的值.若实数x.y满足√x-y+|y+3|=0,求y的x方的值。 若实数X,Y满足X^2+3Y^2-12Y+12=0,则Y的值是? 若x、y的值满足3x-y-7=0,2x+3y=1,y=kx+9,则k的值应等于 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！ 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. 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 若x,y为实数且满足 x^+3y^-12y+12=0 ,求y^x的值? 若x＞1,y＞0 ,且满足xy=x^y,x/y=x^3y,求x+y的值 RT.若x>1,y>0,且满足xy=x^y,x/y=x^3y,则x+y的值为? 若x＞1,y＞0,且满足 xy=x^y,x/y大于等于x^3y,则x+y的值为