已知x,y,z满足2/x=3/y-z=5/z+x,则5x-y/y+2x的值

已知x,y,z,同时满足方程x+3y-5z=0,2x-y-3z=0求x：y：z的值 已知x,y,z满足方程组：4x-5y+2z=o;x+4y-3x=0,求x:y:z的值 已知x、y、z满足2x+3y+z=48 x-2y+2z=56 3x+5y+3z=52 则x+y+z的值为多少 急 已知x、y、z满足方程组：x+y-z=6；y+z-x=2；z+x-y=0 求x、y、z的值 已知x.y.z满足方程组x+2y-4z=0 2x+y-5z=0 求x:y:z的值 已知实数x.y.z满足x+y=5及z的2次方=xy+y-9则x+2y+3z=? 已知实数x,y,z满足x-y=5,z^2=-xy-y-9,求x-2y+3z的值 已知x/4=y/5=z/6 求x+y+z/3x-2y+z的值 已知x/4=y/5=z/6,求x+y+z/3x-2y+z的值. 已知实数x,y,z,满足x+y=5,z²=xy+y=9,求x+2y+3Z的值 已知x y z 满足x+y=5,z²=xy+y-9,求x+2y+3z的值 已知x,y,z满足3x+7y+z=5 4x+10y+z=3 求x+y+z的值