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众所周知,高考试题坚持能力立意,注重考查知识迁移能力,考查理性思维的深度和广度,考查进一步学习的潜能。因此,在数学学习的过程中,我们要以不变应万变,立足基础,注重定理、概念、公理的产生和发展过程,深化对数学知识的理解,提高思维水平。本文通过对排列组合三个具体例子的剖析和变式探究,揭示数学的内在规律,供大家参考。例1平面内有两组平行线,一组有m条,另一组有n条。这两组平行线相交,可以构成平行四边形的个数为()。
As we all know, college entrance examination questions adhere to the ability to conception, pay attention to test knowledge transfer ability, examine the depth and breadth of rational thinking, examine the potential for further learning. Therefore, in the process of mathematics learning, we should, basing ourselves on the foundation of the fundamentals, pay attention to the generation and development of theorems, concepts and axioms, deepen the understanding of mathematical knowledge and raise the level of thinking. Through the analysis of the three specific examples of permutations and combinations, this paper reveals the inherent laws of mathematics for your reference. Example 1 There are two parallel lines in the plane, one for m and the other n. The two groups of parallel lines intersect, the number of parallelograms that can form ().