2013中考数学模拟题(2)(3)

2013年中考模拟试题

线，当它们的比例系数k是不同的 10、A；提示：根据中位数的概念，又37出现4次，次数最多

二、11、a(x?1)2；提示：ax?2ax?a?a(x2+2x+1)=a(x+1)2 12．x??2且x?1； 13．众数，平均数，中位数； 14．x?4；提示：解不等式y??2212x?2x＜0并取左侧的部分 2 15．相等，bc米；提示：根据图形割部关系 16．17或18或19

三、17、解：原式?3?2?1?2 ············································································ 6分 18．解：原式?2a?1(a?2)(a?2)(a?1)(a?1)··?(a?2)(a?1)?a2?a?2 4分 2a?2(a?1)1 由a?a?0得原式?0?2??2 ··········································································· 6分 19、 ························································································································ 5分

A

B

第19题 C 人数 50 40 30 B?? A? A??

C?

20 10 B? O 阅读 运动 娱乐 其它 项目

第22题

数学试卷 第 11 页 （共 11 页）

2013年中考模拟试题

20．（1）100名 ········································································································· 2分 （2）36 ·················································································································· 4分

（3）如上图 ············································································································· 6分

21．（1）P(偶数)??2 ·························································································· 2分 3 （2）能组成的两位数为：86，76，87，67，68，78 ······································· 4分