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备注一下使数学公式的使用语法
单行公式语法 - $ 你的公式 $
$ log_2^n $
多行公式语法 - $$ 你的公式 $$
$$ log_2^n => log_2^9 = 3, n = 9 $$
@sunrisepeak 全局队列或许也可以用CAS优化
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