2009年山东烟台数学中考题答案

烟台数学中考题答案

2009年烟台市初中学生学业考试数学试题参考答案及评分意见

一、选择题（本题共12个小题，每小题4分，满分48分）

1 2 3 4 5 6 7 8 题号

B D C C B A A B 答案

二、填空题（本题共6个小题，每小题4分，满分24分） 13．

9 B

10 B

11 D

12 C

1

14

． 15．17 16．1 17．20 18．①，③，④ 4

三、解答题（本题共8个小题，满分78分） 19．（本题满分6分）

2)0

············································································· 2分

(1 1 |1．

················································································· 4分

111． ·

····························································································································· 6分 1 ·

20．（本题满分8分） 解：（1）（2）

1

····························································································································· 1分 2

1 ··································································································································· 3分 3

（3）根据题意，画树状图： ································································································· 6分 开始

第一次 1 2 3 4

第二次 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4

（第20题图）

由树状图可知，共有16种等可能的结果：11，12，13，14，21，22，23，24，31，32，33，34，41，42，43，44．其中恰好是4的倍数的共有4种：12，24，32，44． 所以，P（4的倍数）

41

······················································································ 8分 ． ·

164

或根据题意，画表格： ··········································································································· 6分

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