S/(S/T1+S/T2)=S/(S(T1+t2)/T1T2)怎么转化说下.

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S/(S/T1+S/T2)=S/(S(T1+t2)/T1T2)怎么转化说下.
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S/(S/T1+S/T2)=S/(S(T1+t2)/T1T2)怎么转化说下.
S/(S/T1+S/T2)=S/(S(T1+t2)/T1T2)怎么转化
说下.

S/(S/T1+S/T2)=S/(S(T1+t2)/T1T2)怎么转化说下.
左边通分就行了.追问:写下步骤.