```tex
\begin{align*}
f(x) \triangleq \begin{multlined}
\frac32 - x, & \frac12 < x\leq 1, \\
\frac34...
```tex
\begin{align*}
f(x) \triangleq \begin{multlined}
\frac32 - x, & \frac12 < x\leq 1, \\
\frac34 - x, & \frac14 < x\leq \frac12, \\
\frac38 - x, & \frac18 < x\leq \frac14, \\
\vdots & \vdots
\end{multlined} \\
\end{align*}
```
请问怎么改啊
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