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胖博士奥数课堂688期：20200114（四年级）填数问题视频讲解
请将 1～12 这 12 个自然数分别填入下图的方框，每个数只出现 1 次，使得每个等式都成立。（2011年世少赛晋级赛四年级第15题）
胖博士奥数课堂8/274
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