sum_range Optional.The actual cells to add, if you want to add cells other than those specified in the range argument. If the sum_range argument is omitted, Excel adds the cells that are specified in the range argument (the same cells to which the criteria is applied).. Sum_range should be the same size and shape as range.If it isn't, performance may suffer, and the formula will sum a range of ...

To check for any security issues, go to Windows Defender settings, select Show details, and check your security status.

Office 小型企业版、Office 家庭和学生版以及 Office 专业版可在单台计算机上安装。 如果尝试在另一台（自己所有的或其他人所有的）计算机，或者硬件更改后的同一台计算机上安装和激活这些版本的 Office，则可能会看到一条错误消息，提示你已达到最大激活数量。

On the Choose an account screen, click the Microsoft account button.; On the Add your Microsoft account screen, enter the email address and password associated with your Microsoft account.; On the Make it yours screen, you'll have the option to make this Microsoft account your primary account. (This makes sign-in, settings, and syncing happen automatically for all other Microsoft services.)

按 Xbox 按钮 打开导航页，然后选择“我的游戏和应用”>“查看全部”。; 在“完整库”>“拥有的游戏”下，你将看到登录到主机的档案所拥有的所有游戏。 如果主机上没有安装你拥有的游戏，则将在游戏名称上看到一个下载图标。 选择游戏会提示你先安装游戏，然后才能玩游戏。

Choose Open all, or Open all in new window, or Open all in new InPrivate window.

Get Microsoft Project help and training content. Find training courses, support, and additional resources for Microsoft Project.

Узнайте, как установить последнюю версию драйвера для принтера. Если вы недавно обновили Windows, вам может потребоваться переустановить драйвер принтера.

Learn how to download, install, and configure Language Accessory Packs for Microsoft 365 for additional display, help, and proofing tools.

Learn how to join a Microsoft Teams meeting if you don't have an account. Join a Teams meeting as a guest in the Windows app or on the web.