happiness 发表于 2025-3-30 08:58:04

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倔强不能 发表于 2025-3-30 13:03:38

Alfréd Kaiser,Tatiána KluvánkováIn this chapter, we discuss the children’s earliest work on combinatorics problems, the second- and third-grade efforts on the shirts and jeans problem:

DUCE 发表于 2025-3-30 17:57:31

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查看完整版本: Titlebook: Combinatorics and Reasoning; Representing, Justif Carolyn A. Maher,Arthur B. Powell,Elizabeth B. Upt Book 2010 Springer Science+Business Me