山东省青岛胶州市2020-2021学年高二数学下学期期末考试试题（PDF）答案

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1、2020-2021学年度第二学期期末学业水平检测高二数学参考答案一、单项选择题：本大题共8小题，每小题5分，共40分。1-8：AACDACCB二、多项选择题：本大题共4小题，每小题5分，共20分。9．BC；10．AC；11．ABC；12．ACD三、填空题：本大题共4个小题，每小题5分，共20分。31913．；14．3；15．xsinx；16．（1）；（2）；2n124四、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.（10分）解：（1）若选择①，由aa51与aaaa20294729a23a217解得:

2、或（由于an1an，舍去）············································2分a17a399a2a1d3a11设公差为d，则，解得·············································4分aa8d17d291所以数列{a}的通项公式为a2n1····························································5分nn若选择②，设公差为d，由S25a，得5a25a；a

3、ad3·································2分513121a12d5a1a11则，解得····································································4分ad3d21所以数列{a}的通项公式为a2n1····························································5分nn若选择③，S1,n1因为an·······················

4、······················································2分SS,n2nn11,n1解得an················································································4分2n1,n2所以数列{a}的通项公式为a2n1····························································5分nn1111（2）由题意得:b()·

5、·································6分n(2n1)(2n1)22n12n1所以Tbbbbn123n11111111(1)···································8分2335572n12n111n(1)·····································································10分22n12n118.（12分）13457解：（1）由已知可得：x4，y

6、4200··································1分5高二数学答案第1页(共5页)（用数学的眼光观察世界，用数学的思维分析世界，用数学的语言描述世界）55222222xiyi103000，xi13457100，···································3分i1i15xiyi5xy1030008400019000所以bˆi1950····································4分52221005420xi5xi1

7、所以aybˆx42009504400，所以yˆbˆxa950x400·················5分当y950x40010000时，x11所以估计第11轮联赛观看比赛的人数y超过10000人··········································6分（2）设甲被选中为事件A，乙被选中为事件B··················································7分2C1015由题意可知：P(A)·························

8、········································8分3C20261C414P(AB)····························