已知x+3y+z=11 x+y=7,则7x+10y+3z=?

已知x+3y+z=11 x+y=7,则7x+10y+3z=? 已知关于x y z的方程组2x-3y+5z=7 x+2y-3z=8,则4x+y-z= 已知4x-3y-6z=0,x+2y-7z=0,则x-y+z/x+y+z=_________ 已知4x-3y+6z=0 x+2y-7z=0 则x-y+z/x+y-z=? 已知,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(x+y+z)=—— 已知{4x-3y-6z=0、x+2y-7z=0,则x-y+z：x+y+z= 已知(x-y)/13=y/7,则（x+y）/y=已知x/6=y/4=z/3(x,y,z均不为零）,则(x+3y)/(3y-2z)= 已知5x=3y,4z=7y,求x:y:z 已知x+2y-7z=0,3x-5y+z=0,用z的代数式分别表示x,y,则y= x= 已知X+4Y+Z=24,2X+7Y+2Z=41,则x:y:z= 已知3x+7y+z=315和4x+10y+z=420,求x+y+z 已知2x+5y+4z=6 3x+y-7z=-4求x+y-z 已知x+2y-3z=0,5x-6y+7z=1;则x:y:z=?把“5z-6y+7z=1”改成“5x-6y+7z=0” 已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值 已知：4x-3y-6z=0,x+2y-7z=0.求出x-y+z÷x+y+z=? 已知x、y、z满足{3x+7y+z=5 ,求x+y+z的值 {4x+10y+z=3 已知x,y,z满足3x+7y+z=5 4x+10y+z=3 求x+y+z的值 已知4x-3y-6z=0,x+2y-7z=0,求5x+2y-z/2x-3y-10z