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几何中的定理，是典型的数学问题。初中平面几何课本（共三册七章）向同学们介绍了９０余条定理（不包括推论）。可以说，正是由于这些定理的存在，才形成了平面几何教材的体系。定理的证明方法具有代表性和典型性。通过证明这些定理，不仅能使学生搞清楚数学概念间的联系...
The theorem in geometry is a typical mathematical problem. The junior high school plane geometry textbook (a total of three volumes and seven chapters) introduces more than 90 theorems to the students (not including inferences). It can be said that it is because of the existence of these theorems that the system of plane geometry textbooks has been formed. The proof of the theorem is representative and typical. By proving these theorems, we can not only make students understand the connection between mathematical concepts...