2S/(S/V1+S/V2)怎么整理出的2V1V2/(V1+V2)

问题描述:

2S/(S/V1+S/V2)怎么整理出的2V1V2/(V1+V2)

2S/(S/V1+S/V2)=2/(1/V1+1/V2)=2/((V1+V2)/V1V2)=2V1V2/(V1=V2)