请高手用英语回答4个有关于微软办公那个Word Excel的问题!谢谢!

请高手用英语回答4个有关于微软办公那个Word Excel的问题!谢谢!
1.What is MS Excel 2007?
2.What are the command TABS in MS Excel 2007?
3. What are Formulas?Functions?
4.Give 5 examples of a Formulas or Function.
请高手用英语回答4个有关于微软办公那个Excel的问题!最好能详细点!谢谢!

1.Microsoft Excel is a spreadsheet program which allows one to enter numerical values or data into the rows or columns of a spreadsheet,and to use these numerical entries for such things as calculations,graphs,and statistical analysis.
2.Microsoft Excel tabs make organizing different data worksheets easy while keeping them in just one file.See how to format and manage the tabs in Excel.
3.Formulas calculate a list of numbers (or values) in a specific order.
A formula in Microsoft Excel always begins with an equal sign (=).The equal sign tells Excel that the following numbers or cells make up a formula.The general rules of mathmatics apply here in deciding the order of operation withinn a formula.
Excel calculates the formula from left to right,according to a specific order for each operator in the formula.Formulas in Microsoft Excel follow a specific syntax (or order),that includes an equal sign (=) followed by the elements to be calculated (the operands),which are separated by calculation operators (+,-,*,/...etc).Each operand can be a value that does not change (a constant value),a cell or range reference,a label,a name,or a worksheet function.You can change the order of operations by using parentheses.
4.web site address following for your refrence.