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美国数学竞赛 xyz and Birkhuaser出版社(生肉)(12本)(pdf)
102 combinatorial problems from the training of the USA IMO team by Titu Andreescu, Zuming Feng 103 trigonometry problems from the training of the USA IMO team by Titu Andreescu, Zuming Feng 104 Numbe…- 133
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