若(x-3):(y+4):(2 z+3)=2:3:5 且3x-2y+z=23.则x:y:z=______
若(x-3):(y+4):(2 z+3)=2:3:5 且3x-2y+z=23.则x:y:z=______
若2x=3y=5z,且x,y,z都是正数,则2x,3y,5z从小到大依次为______.
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
已知3x-2y-5z=0,2x-5y+4z=0,且x,y,z均不为0,求3x*x+2y*y+5z*z/5x*x+y*y-
若2分之x+y=3分之y+z=5分之x+z 且x+y+z=18 求x,y,z的值
已知方程组4x-y+3z=0 2x+y+6z=0且xyz不等于0,则x/y+y/z+z/x是多少
x/2=y/3=z/5 x+3y-z/x-3y+z
已知3x-2y-5z=0,2x-5y+4z=0,且x,y,z都不为0,求(3x*x+y*y+4z*z)/(5x*x+y*
已知x:y:z=2:3:4,且x-y+z=36,求x+y+z的值.
已知x:y:z=2:3:4,且x+y+z=18,求x,y,z的值
若x/3=y/2=z/5,则2x-3y-z/x-y+z=
若x/3=y/4=z/5,求x+y+z/3x-2y+z的值.