广西柳州2022届高三三模——理数 PDF版含答案

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柳州市 2022 届高三第三次模拟考试
理科数学参考答案
一、选择题（本题共 12 小题，每小题 5 分，共 60 分．）
二、填空题（本题共 4 小题，每小题 5 分，共 20 分．）
13．
5
； 14．
3
； 15．
16
； 16．
5
4
．
三、解答题（共 70 分，解答应写出文字说明、证明过程或演算步骤.）
17．解：(1) 因为 
   ,由诱导公式得   ·············· 1 分
由正弦定理得   ·······················································································2 分
  ······································································································3 分
 
cosA
·····························································································4 分
  ····································································································································5 分
∵    
······················································································································ 6 分
(2)∵ 成等比数列   ···································································7 分
又因为   


··································································8 分
     ·············································································9 分
     ·················································································· 10 分
   ························································································ 11 分
又 ∵  
，△ 为等边三角形·································································· 12 分
18．解：因为  
 ，令  
，则  
可转化为  
 
，·················· 2 分
与的相关系数为： 


 
·············································· 3 分


×


  ············································································································4 分
因为  ，所以用反比例函数模型拟合效果更好·············································5 分
(2)



−××
−× 
  ····················································7 分
则
 
 − ×  ··································································9 分
题号
1
2
3
4
5
6
答案
C
C
A
B
D
D
广西柳州2022届高三三模——理数 PDF版含答案.pdf

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作者：envi 分类：分省 价格：3知币 属性：8 页 大小：600.41KB 格式：PDF 时间：2024-09-27

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