a+b+c=80,a:b:c,则a=( ),b=( ),c_=( )a+b+c=80,a:b:c=5:7:4,则a=( ),b=( ),c_=( )

问题描述:

a+b+c=80,a:b:c,则a=( ),b=( ),c_=( )
a+b+c=80,a:b:c=5:7:4,则a=( ),b=( ),c_=( )

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