https://zh.wikipedia.org/zh-tw/%E5%A5%A7%E9%99%B6%E7%B4%80%EF%BC%8D%E5%BF%97%E7%95%99%E7%B4%80%E6%BB%85%E7%B5%95%E4%BA%8B%E4%BB%B6
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指數運算