若x/3=y/4=z/5,求x+y+z/3x-2y+z的值.有大赏100
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若x/3=y/4=z/5,求x+y+z/3x-2y+z的值.有大赏100
若x/3=y/4=z/5,求x+y+z/3x-2y+z的值.
有大赏100
若x/3=y/4=z/5,求x+y+z/3x-2y+z的值.有大赏100
设x/3=y/4=z/5=m
则x=3m,y=4m,z=5m
则x+y+z/3x-2y+z=(3m+4m+5m)/(9m-8m+5m)=12/6=2
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