【全国】中考数学考前押题密卷-数学（南京卷）（参考答案及评分标准）.pdf

2０24年中考考前押题密卷(南京卷）

数学·参考答案

第Ⅰ卷

一、选择题（本大题共6个小题，每小题2分,共１２分。在每个小题给出的四个选项中，只有一项符合

题目要求，请选出并在答题卡上将该项涂黑）

13４５６

ＢBＤCCC

第Ⅱ卷

二、填空题（本大题共1０小题，每小题2分,共0分)

7。x≠±1ﻩﻩ8。m（x＋1）29。24°ﻩﻩ１0．1

21

12-455

11．（）ﻩﻩ12.４5°ﻩﻩﻩﻩﻩ1３．1４.２。25或4。75

9

15.m〈﹣ﻩﻩ16。14

三、解答题（本大题共１1个小题，共８8分。解答应写出文字说明,证明过程或演算步骤）

1７．(6分）

+1

‒1＜

解：解不等式2，得

ｘ＞﹣１，········································

···········2分

解不等式x＞3（ｘ﹣1），得

3

＜

2

x,··········································

··············4分

3

＜

∴不等式组的解集为﹣1〈ｘ2，

∴不等式组的整数解为

０，１．·········································

···················6分

18．(6分)

2

‒3

(1-)÷

‒32

解:‒6+9

第1页共13页

‒3‒(‒3)2

=

‒3•(‒3)

3

=-

,·········································

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

33

=-=‒

当a＝23时，原式232.

·············································

······6分

19。(8分）

解:设每件售价应定为x元，则每件的销售利润为（ｘ﹣４０）元,日销售量为

60‒

+×

20510=(14０﹣2x）件，

依题意得:(x﹣４0）（１4０﹣2x）=(60﹣４０）

×0，·········································

３分

整理得：ｘ﹣110x+３0０0＝０，

解得：x＝50，x＝60（不合题意，舍去）．

12

答：每件售价应定为5０

元．···········································

···················6分

0．(８分)