╬╬════
╬                                                        Riddle@NewSMTH
║ 脸打扁了多大呀
           （数学名词）
                                                                 圕   ╬
                                                                  ═╬╬

注：给出谜底时，请同时提供猜谜思路，以便于新手更容易学到知识，谢谢
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