广东深圳光明区2024年八年级下学期期末考试数学试卷答案.pdf

2023-2024学年下学期期末学业水平调研测试

八年级数学参考答案与评分标准

一、选择题（本大题共10小题，每小题3分，共30分。每小题有四个选项，其中只有一项是正确的）

题号12345678910

答案BACDBADBCC

5315

二、填空题（本大题共小题，每小题分，共分）

341

11．xx212．213．x14．2015．

22

三、解答题（本大题共7小题，共55分）

5x2≤3x2①



16．

3x②

12x



解：解不等式①，可得x2················································2分

解不等式②，可得x3····································································4分

在同一数轴上表示不等式①②的解集

······················································5分

01234

所以，原不等式的解集是x2····························································6分

x22x

17．1．

x2x2

x2x22x

解：原式······························································2分

x2x2x2

xx1x2

··········································································4分

x2x

x1························································································5分

当x1时，原式112．·························································7分

（代入求值时，代入正确给1分，结果正确给1分）

第1页共5页

3x1

18．