2S/(S/V1+S/V2)怎么整理出的2V1V2/(V1+V2)

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2S/(S/V1+S/V2)怎么整理出的2V1V2/(V1+V2)

2S/(S/V1+S/V2)怎么整理出的2V1V2/(V1+V2)
2S/(S/V1+S/V2)怎么整理出的2V1V2/(V1+V2)

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)