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Excel documents are known as workbooks. A single workbook can store as many sheets as will fit into memory, and these sheets are stacked like the pages in a notebook. Sheets can be either worksheets (a normal spreadsheet-type sheet with rows and columns) or chart sheets (a special sheet that holds a single chart). | The facts you need fast Microsoft Office Excel 2007 FOR Q U I C K REFERENCE A Quick Reference for the Rest of Us FREE eTips at dummies.com- John Walkenbach Colin Banfield Excel 2007 FOR dummies QUICK REFERENCE by John Walkenbach and Colin Banfield 1807 S WILEY i 2007ï I_Ir BICKNTINNI AL Wiley Publishing .