楼主: superacid
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2009全国高中数学联赛试题新鲜出炉(附答案) |
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公式D F2 U L2 U B2 U R2 U R' F2 R L U L' R' U R L' U L U L U2 L' U' L U2 L'
数列11121131221231321332223233311 |
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