将7个大小相同的桔子分给4个小朋友,要求每个小朋友至少得到1个桔子,一共有几种分配方法?A.14 B.18 C.20 D.22

作者: tihaiku 人气: - 评论: 0
问题 将7个大小相同的桔子分给4个小朋友,要求每个小朋友至少得到1个桔子,一共有几种分配方法?
选项 A.14 B.18 C.20 D.22
答案 C
解析 插板法。每个小朋友至少得到1个桔子,7个桔子构成6个空,选择其中3个空插入隔板,将桔子分为4份,

相关内容:大小,桔子,小朋友,要求,共有,分配,方法

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