四川省绵阳市高中2022级第三次诊断性考试数学试题及答案（A卷）.pdf

绵阳市高中2022级第三次诊断性考试

数学参考答案及评分标准

一、选择题：本大题共8小题，每小题5分，共40分．

BABCDACC

二、选择题：本题共3小题，每小题6分，共18分．

9．ACD10．AB11．AB

三、填空题：本大题共3小题，每小题5分，共15分．

2

12．−813．0.4214．{(a，b)|a0或blna}

四、解答题：本题共5小题，共77分．解答应写出文字说明、证明过程或演算步骤．

q

15．解：（1）设数列公比为，

由，，成等差数列得：4a4a+a3分

4a32a4a5435，

22

:4aq4a+aq，即：q-4q+40，可得q2，5分

333

n

na2

数列{a}的通项公式为：n；6分

（2）

2n-12n-12

n

2+++······························································7分

2n-1

444

nn3n632n

---

2+2+2+2······························································8分

n3633n

---

2(1+2+2+...+2)···························································9分

············································································11分

分

数学参考答案及评分标准第1页共8页

16．解=0，····································