已知4x-3y-6z=0 ① ,x+2y-7z=0 ②,且x,y,z均不为0,求3x+2y+z÷x+2y+3z的值

已知4x-3y-6z=0 ① ,x+2y-7z=0 ②,且x,y,z均不为0,求3x+2y+z÷x+2y+3z的值
已知4x-3y-6z=0 ① ,x+2y-7z=0 ②,且x,y,z均不为0,求3x+2y+z÷x+2y+3z的值

已知4x-3y-6z=0 ① ,x+2y-7z=0 ②,且x,y,z均不为0,求3x+2y+z÷x+2y+3z的值
4x-3y-6z=0 ①
x+2y-7z=0 ②,
②X4-①,得：11y-22z=0,.y=2z.
把y=2z代入②,得：x+4z-7z=0,.x=3z.
把 x=3z ,y=2z 代入:
3x+2y+z÷x+2y+3z
=(9z+4z+z)/(3z+4z+3z)
=(14z)/(10z)
=7/5
=1.4