2010年中考数学考前50天得分专练(20)(3)

中考复习

参考答案

一、填空题（每小题4分，共20分） 1．B 2．C 3．A 二、填空题（每小题3分，共30分） 6．

7．(x 3)(x 3)

4．B

5．B

10．0.88

8．4

9．50

11．2 m 14 12．240 13． 14．8 15．7.5 三、解答题 16．（1）16 ····························································································································· 3分 （2）

······························································································· 4分 17．（1）1 28％ 38％ 34％ ···························································································· 2分 （2）816 0.34 2400 ········································································································ 1分

A 2400 (840 816 144) 600 ···················································································· 2分 B 1 (0.34 0.25 0.06) 0.35 ······················································································ 3分 A的值为600，B的值为0.35 ····························································································· 4分 （3）408 34％ 1200 ········································································································ 1分 2400 1200 2 ···················································································································· 2分

该校学生平均每人读2本课外书．

18．（1）x1 1，x2 3 ········································································································ 2分 （2）1 x 3 ························································································································ 2分 （3）x 2 ····························································································································· 2分 （4）k 2 ····························································································································· 4分

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