markdown数学公式中括号加长

在Markdown数学公式中，可以使用小括号和中括号直接输入，而大括号则需要加上转义字符进行输入。例如，要输入一个加长的大括号，可以使用转义字符\{和\}。这样可以确保大括号在数学公式中正确显示。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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