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Update 第05课：分支结构.md #64

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7 changes: 6 additions & 1 deletion 第05课：分支结构.md
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Expand Up @@ -31,7 +31,12 @@ else:
如果要构造出更多的分支，可以使用`if...elif...else...`结构或者嵌套的`if...else...`结构，下面的代码演示了如何利用多分支结构实现分段函数求值。

$$
f(x) = \begin{cases} 3x - 5, & (x \gt 1) \\ x + 2, & (-1 \le x \le 1) \\ 5x + 3, & (x \lt -1) \end{cases}
f(x) =
\begin{cases}
3x - 5, & x > 1 \\
x + 2, & -1 \leq x \leq 1 \\
5x + 3, & x < -1
\end{cases}
$$

```Python
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