(a+b)³展开公式：a³+3a²b+3ab²+b³ (a-b)³展开公式：a³-3a²b+3ab²-b³. 完全立方公式包括完全立方和公式和完全立方差公式，完全立方和（或差）公式指的是两数和（或差）的立方等于这两个数的立方和（或差）与每一个数的平方乘以另一个数3倍的和（或差）。
b站开启私人直播间的方法是在直播中心中设置直播间密码。 首先，登录b站账号并进入直播中心。在直播中心页面，选b 择“直播设置”选项。接下来，在直播设置页面中，找到“直播间密码”选项，并点击设置按钮。
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