x/2=y/3=z/5则（2x+y-z)/x=___
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x/2=y/3=z/5则（2x+y-z)/x=___x/2=y/3=z/5则（2x+y-z)/x=___x/2=y/3=z/5则（2x+y-z)/x=___-13y=3x/2z=5x/22x+y-z)
x/2=y/3=z/5则（2x+y-z)/x=___
x/2=y/3=z/5则（2x+y-z)/x=___
x/2=y/3=z/5则（2x+y-z)/x=___
-1
3
y=3x/2 z=5x/2
2x+y-z)/x=1
令x/2=y/3=z/5=k k≠0
那么x=2k y=3k z=5k
（2x+y-z)/x
=（4k+3k-5k）/2k
=2k/2k
=1
若x+y+z=3y=2z,则x/x+y+z=?
x/2=y/3=z/5 x+3y-z/x-3y+z
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