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课本上例题、习题具有问题的典型性、知识的基础性、解答的规范性、应用的广泛性以及问题的可推广性和研究性等特点,因而成为中考命题取之不尽、用之不竭的“源泉”.利用课本例、习题命制中考题的常用手段有:利用问题的结论解题,改编问题,拓广问题的内涵等.本文以人教版教材九年级上册第102页第5题为例,说明课本习题是怎样通过“基本图形”的建构得到中考题的.先看课本习题:如图1,PA、PB是⊙O的切线,A、B为切点,AC是⊙O的直径,∠BOC=25°,求∠P的度数.
Textbook example, the problems with typical problems, the basis of knowledge, the standardization of answers, the wide range of applications and issues can be generalized and research characteristics, and therefore become a senior high school entrance examination questions inexhaustible, inexhaustible The use of textbook examples, exercises commonly used in exam questions are: the use of the problem solving the problem, the problem of adaptation, to broaden the content of the problem, etc. In this paper, the People’s Education Publishing House ninth grade page 102 The fifth question as an example, shows how the textbook exercises through the “basic graphics ” construction to get the test questions. Look at the textbook exercises: Figure 1, PA, PB is the tangent of ⊙ O, A, AC is the diameter of ⊙ O, ∠ BOC = 25 °, find the degree of ∠ P.