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## **题目 6** 证明:二叉树中第 ( k ) 层最多有 ( 2^k ) 个顶点;并且若某棵树在第 ( k ) 层恰有 ( 2^k ) 个顶点,则它必须有 ( 2^{k+1} - 1 ) 个顶点。
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