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全日制十年制学校高中数学课本第三册《概率》一章公式较多,这些公式都是在一定的条件下才能成立的,也只有在满足条件的情况下才能使用。可是学生在解题时往往不顾条件,生搬硬套学过的公式,从而导致错误的结果。究其原因,一是不重视公式中条件的作用,二是不善于发现具体问题中的条件,三是不善于根据条件作出准确的判断,选用合适的公式。因此,在本章各公式的教学过程中,必须使学生明确区分公式中的条件和结论,掌握各公式之间的联系和区别。由于本章各公式都各有其具体的特定条件,下面按各公式在教材中出现的先后次序,分别谈一些粗浅的看法。
Full-time 10-year school high school mathematics textbook Volume III “Probability” chapter more formulas, these formulas are only in certain conditions can be established, and only to meet the conditions of the circumstances can be used. However, students often neglect the conditions in the solution, students mechanically learned the formula, resulting in the wrong result. The reason is that one does not pay attention to the role of the conditions in the formula, the other is not good at finding the specific conditions in the third is not good at making accurate judgments based on the conditions, the selection of the appropriate formula. Therefore, in the process of teaching the formulas in this chapter, students must be made to clearly distinguish the conditions and conclusions in the formulas and grasp the connections and differences between the formulas. Since each of the formulas in this chapter has its own specific conditions, the following is a brief summary of the various formulas that appear in textbooks.