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電腦的概念裡是沒有減的，只能透過加上負數來作減去的動作。
使用樞紐分析表和圖表可以處理大量表格資料。
儲存格的一種自訂格式：0;-0;0;@ 代表 正數;負數;零;文字
# 代表 省略0
, 代表 千分位
今日函數
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mid 從第幾個字開始傳回數個文字
語法：=mid(參照文字,第幾個開始,傳回文字數量)
datedif 計算日期之間的差距
語法：=datedif(參照日期,結束日期,欲顯示之格式※)
※ 格式上："y"求年 "m"求月 "d"求日
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