平方
平方（粵拼：ping4 fong1），又叫2次方（ji6 ci3 fong1）或兩次方（loeng5 ci3 fong1），係指將一個數自己乘自己一次。表示方式係右上角寫個2字，例如 y 嘅平方，寫做 y 2 } 。
睇埋
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