在有限制条件的排列应用题中 ,有一类含有多个限制条件的应用题 ,由于关系比较复杂 ,学生求解起来十分困难 .为此 ,笔者在教学时采用分类计数方法解决这类问题 ,学生学习起来感到非常方便 ,现举例说明如下 .例 1　 (高中新教材第二册 (下Ｂ) 1 0 5页第1 3题 ) :甲、乙、丙、丁 In the application of limited conditions, there is a class of applications with multiple constraints. Because the relationship is more complicated, students find it very difficult to solve them. For this reason, the author uses classifier counting methods to solve these problems in teaching, students learn. It is very convenient to use it, and examples are as follows. Example 1 (New high school textbook 2 (b) 1 0 5 page 1 3) : A, B, C, D