Hi a b and c

其實兩者都皆為正確答案。a, b, and c 是美式用法，也就是大部分台灣老師所教的方法，只要寫超過三樣東西以上 ...

We have B—a = (B–a) n (A* U A) = (ab) U A, and (ab) c A*, from which it follows that (ab) ... For...

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