若3A=5B=7C那么A:B:C=______:______:______.
7个回答
3a=5b=7c=k
a=k/3=35k/105
b=k/5=21k/105
c=k/7=15k/105
a:b:c =35k/105:21k/105:15k/105=35:21:15
相关问题
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