20/48=( )/60=10/( )=( )/84=( )/108=5/(

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20/48=()/60=10/()=()/84=()/108=5/(20/48=()/60=10/()=()/84=()/108=5/(20/48=()/60=10/()=()/84=()/108=5

20/48=( )/60=10/( )=( )/84=( )/108=5/(
20/48=( )/60=10/( )=( )/84=( )/108=5/(

20/48=( )/60=10/( )=( )/84=( )/108=5/(
20/48=5/12
20/48=(25)/60=10/(24)=(35)/84=(45)/108=5/(12)

首先对20/48约分得5/12。
分子分母同乘5得25/60,乘7得35/84,乘9得45/108。
所以是20/48=25/60=35/84=45/108=5/12

20/48=5/12=25/60=10/24=35/84=45/108