英文回答：
Excel formulas and functions, which are important tools for Excel software, play an important role in conducting mathematical calculations, logical judgments, text processing, etc., and are important for improving work efficiency. When applying Excel formulas and functions, the following principle is to be followed： formulas and functions must start with an equal sign “=” to indicate their speciality, otherwise Excel will treat them as ordinary text. Cell references in formulas can be used for relative, absolute and mixed references, and the appropriate reference must be selected on a case—by—case basis. When using a function, be careful with the order and format of the input of the parameter. Each function requires different parameters and needs to enter the parameter as required by the function. Forplex formulae and functions, the order of priority of calculations should be accurately controlled by using brackets in order to avoid erroneous calculations. When applying Excel formulae and functions, care is taken to ensure that the formula format, the way the cell refers to, the input of the function parameters and the order of priority of the calculation are obtained.
Excel公式和函数作为Excel软件的重要工具，在进行数学计算、逻辑判断、文本处理等操作时发挥着重要作用，对提高工作效率具有重要意义。在运用Excel公式和函数时，需遵循以下原则：公式和函数必须以等号“=”开头，以示明其特殊性，否则Excel会将其作为普通文本处理。公式中的单元格引用可以采用相对引用、绝对引用和混合引用，必须根据具体情况选择合适的引用方式。使用函数时务必注意参数的输入顺序和格式，各函数有不同的参数要求，需按照函数的要求输入参数。对于复杂的公式和函数，应通过使用括号来精确控制计算的优先顺序，以避免错误的计算结果。在运用Excel公式和函数时，务必注意公式的格式、单元格引用的方式、函数参数的输入以及计算的优先顺序，以确保获得准确的计算结果。
Excel has a number ofmonly used functions, including mathematical, logical, text and date functions. The mathematical function is used for mathematical operations, such as generalization, averaging, finding maximum values, minimum values, etc. Logic functions are used to make logical judgements, for example, IF functions can judge results on condition, and AND and OR functions can make logical judgements on multiple conditions. Text functions are used to process text, such as the CONCATENATE function, which connects multiple texts, the LAN function calculates text length, and the LOWER function a
nd the UPPER function, which convert text case. The date function is primarily used to process the date and time, such as the DATE function to create the date, the NOW function to display the current date and time, and the DATEDIF function to calculate the difference between dates. Selecting the appropriate functions according to specific needs and then mastering their usage and rules would make our work more efficient.
Excel里面有一些常用的函数，包括数学函数、逻辑函数、文本函数和日期函数。数学函数就是用来做数学运算的，比如加总、求平均、最大值、最小值等等。逻辑函数是用来做逻辑判断的，比如IF函数可以根据条件来判断结果，AND函数和OR函数可以做多个条件的逻辑判断。文本函数则是用来处理文本的，比如CONCATENATE函数可以把多个文本连接起来，LEN函数可以算文本长度，还有LOWER函数和UPPER函数可以把文本大小写转换。日期函数主要是用来处理日期和时间的，比如DATE函数可以创建日期，NOW函数可以显示当前日期和时间，DATEDIF函数可以算出日期之间的差别。根据具体的需求来选择合适的函数使用，然后熟练掌握它们的用法和规则，这样咱们工作效率就会高一些。
In addition to the usual functions, Excel provides some special functions and tools. Numeri
cal formulas allow multiple values to be counted in bulk and return multiple results. Common array functions include the SUMPRODUCT function, the TRANSPOSE function, the INDEX function, etc.； data pervadance tables allow for the aggregation and analysis of large amounts of data and the rapid generation of reports and graphs, which are important tools for data analysis and report production； conditional formats allow automatic formatting of cells to make the characteristics of data more visible and understandable； validation data can limit and validate the content entered in cells to prevent input errors. These special functions and tools can help users to process and analyse data more easily, improve efficiency and reduce errors. Excel, as a powerful data—processing tool, provides users with a wide range of functions that meet different data—processing needs and help to improve efficiency and data accuracy.
除了常见的函数外，Excel还提供了一些特殊的函数和工具。数组公式可以对多个数值进行批量计算，并返回多个结果，常见的数组函数包括SUMPRODUCT函数、TRANSPOSE函数、INDEX函数等；数据透视表可以对大量数据进行汇总和分析，快速生成报表和图表，是数据分析和报告制作的重要工具；条件格式可以根据条件对单元格进行自动格式化，使数据
的特点更加醒目和易于理解；验证数据可以对单元格输入的内容进行限制和验证，防止输入错误数据。这些特殊的函数和工具可以帮助用户更加方便地进行数据处理和分析，提高工作效率并减少错误。 Excel作为一个强大的数据处理工具，为用户提供了丰富多样的功能，可满足不同数据处理需求，有助于提升工作效率和数据准确性。sscanf函数用法详解 x

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