若4x-3y-6z=0,x+2y-7z=0,则x+y+z/3x-y+z=?

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若4x-3y-6z=0,x+2y-7z=0,则x+y+z/3x-y+z=?
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若4x-3y-6z=0,x+2y-7z=0,则x+y+z/3x-y+z=?
若4x-3y-6z=0,x+2y-7z=0,则x+y+z/3x-y+z=?

若4x-3y-6z=0,x+2y-7z=0,则x+y+z/3x-y+z=?
4x-3y-6z=0,
x+2y-7z=0,即:
4x-3y=6z
x+2y=7z,解得:
x=3z
y=2z
x+y+z/3x-y+z=(3z+2z+z)/(9z-2z+z)=6z/8z=3/4