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近年来,中考命题的热点之一,就是改编课本例题或习题。改编课本例题或习题,必须使改编后的题目不怪不偏,切中教材的重点、难点,使基础知识和基本技能在变式练习中不断以正用、逆用、连用、巧用等形式出现,以便引导学生扎扎实实地掌握和运用课本知识。下面以初中《几何》第三册第130页练习第2题的改编为例,加以说明. 题目:已知如图1,⊙O和⊙O′都经过点A和B,PQ切⊙O于P,交⊙O′于Q、M,交AB的延长线于N.求证:
In recent years, one of the hot spots in the examination proposition has been the adaptation of textbook examples or exercises. Reorganization of examples of textbooks or exercises must be such that the adjusted topics are not misplaced. The key points and difficulties in cutting the textbooks make the basic knowledge and basic skills constantly appear in the form of positive use, inverse use, continuous use, and clever use. In order to guide students to learn and use textbook knowledge. The following is an example of the adaptation of the second problem of Practice Book 3 of Geometry, Volume III, p. 130. Topic: Known as Figure 1, ⊙O and ⊙O′ all pass points A and B, PQ cuts O P, copending O’ to Q, M, and extending AB to N. Proof: