40/()=80/()=()/20=240/()=160/()=560/()=()/8=()/12

问题描述:

40/()=80/()=()/20=240/()=160/()=560/()=()/8=()/12

40/(2)=80/(4)=(400)/20=240/(12)=160/(8)=560/(28)=(160)/8=(240)/12

40/(40)=80/(80)=(20)/20=240/(240)=160/(160)=560/(560)=(8)/8=(12)/12