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可在安卓获取Guide Functions in Excel的历史版本
这是一个伟大的应用程序，让你学习Excel函数
This app you will find step by step tutorials on the most useful and most used functions in Excel. The function tutorials are organized according to the headings found under the Formulas tab in Excel.
* Feature:
+ The interface simple
+ The small capacity, suitable with many smart device nowadays
+ This app is free
+ Reserved for Android operating system.
+ The sufficient content, clear