已知x、y、z满足2/x=3/y-x=5/z+x,则5x-y/y+2x的值为（ ） A .1 B .1/3 C .-1/3 D .1/2

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 已知x,y,z,满足2/x=3/(y-z)=5/(z+x),则(5x-y)/(y+2z)的值为多少? 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z、y、z同时满足x+3y-5z=0,2x-y-3z=0,求x:y:z 已知x,y,z满足2/x=3/y-z=5/z+x,则5x-y/y+2x的值快快 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,满足方程组x-2y+z=0,7x+4y-5z=0 已知正数x,y,z满足x+2y+3z=1,求最小值 已知有理数x.y.z 满足 （x-4)^2+3｜x+y-z｜=0,则(5x+3y-3z)^2008的末尾数字是多少 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+y-Z=6y+z-x=2z+x-y=0求X.Y.Z的值 已知实数x,y,z满足x+y=5,z^2=xy+y-9,那么x+2y+3z=?我很着急 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,那么x+2y+3z=? 已知实数x,y,z,满足x+y=5,z²=xy+y=9,求x+2y+3Z的值 已知实数x、y、z满足x＋y=5,z的平方=xy+y-9,那么x+2y+3z=( ) 已知x,y,z满足x+y=5,z^2=xy+y-9 求x+2y+3z的值