若x,y,z,满足3x+2y+z=5,2x+y-3z=1.y是非负数.求z的取值范围

若x,y,z,满足3x+2y+z=5,2x+y-3z=1.y是非负数.求z的取值范围 已知z、y、z同时满足x+3y-5z=0,2x-y-3z=0,求x:y:z 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 若X.Y.z满足2X+3Y+z=18,4X-3Y+5z=24,求X+3Y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 若有理数x,y,z满足(x-1)的2016次方+|2x-y|+lx-3z|=0,求3x-5y-9z的值 方程组x+3y-z=17 2x-y+z=16中的y、z同时满足y=z+2,求x、y、z.急! 若x、y、z满足2x+3y+z=18,4x-3y+5y=24,求x+3y的值. 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,且z不等于0,2x²-3y²+z²/y²-2z²的值为? 若x+y+z=3y=2z,则x/x+y+z=? x/2=y/3=z/5 x+3y-z/x-3y+z 已知x,y,z,满足方程组x-2y+z=0,7x+4y-5z=0 已知,x,y,z是三个非负实数,满足3x+2y+z=5,z+y-z=2若s=2x+y-z,则s最大值与最小值的和是多少 若实数XYZ满足2|x-y|+√2y+z+z方-z+1//4=0 求X+Y+Z 2y+z在根号里