2s/[(s/v1)+(s/v2)]怎么化成2v1v2/(v1+v2)_其他解答

2s/[(s/v1)+(s/v2)]怎么化成2v1v2/(v1+v2)

人气：334 ℃　时间：2020-01-25 21:16:23

解答

(s/v1)+(s/v2)
=s(v1+v2)/v1v2
2s/[(s/v1)+(s/v2)]
=2s /s(v1+v2)/v1v2
=2v1v2s/s(v1+v2)
=2v1v2/(v1+v2)