2023~2024学年第二学期七年级期末学业诊断
数学试题参考答案及等级评定建议
一、选择题（本大题共10道小题，每小题3分，共30分）
题号12345678910
选项CBBDCAADBC
二、填空题（本大题共5道小题，每小题3分，共15分）
11.a612.0.913.2
14.答案不唯一，例如：∠D∠B（或∠E∠C或AEAC）15.180??2?
三、解答题（本大题共8道小题，满分55分）
16.（每小题3分，共9分）
2412
解：（1）解：原式4xy?xyz·························································2分
4
45······························································3分
xyz.
（2）解：原式22·······················································2分
2a?ab?6ab?3b
22·····························································3分
2a?5ab?3b.
（3）解：原式2·············································1分
123?(123?1)(123?1)
22······························································2分
123?(123?1)
1.················································································3分
17.（本题5分）
解：原式2222···············································1分
（4x?y?x?2xy?y)?x
2······································································2分
（5x?2xy）?x
5x?2y.················································································3分
当x?2，y3时，原式5?（?2）?2?3?16.····································5分
18.（本题4分）
解：转动一次转盘，共有9种结果，每种结果的可能性都相同.······························2分
其中数字为3的倍数的结果有3种，分