河南省正阳县第二高级中学2018_2019学年高二数学上学期周练(五)理.doc

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1、- 1 -河南省正阳县第二高级中学 2018-2019 上期高二理科数学周练(五)一选择题:1.设 0b,则B=()A.30 B.60 C.120 D.1506.在数列 中, ,则 =()na1212,nnaa且 满 足 016aA.-3 B.-2 C.2 D.37.某超市去年的销售额为 a 万元,计划在今后 10 年内每年比上一年增长 10,从今年起 10年内这家超市的总销售额为( )万元A. B. C. D.91.a51. 10(.)a10(.)a8.已知 0B,则下列不等式正确的个数为( )ABCsinAsinBcosAsin2Bcos2A0,集合 A= ,B=2|10xa2|log(4

2、)ayxP: ,q:B=R(1)若 为真,求 a 的最大值(2)若 为为假, ,求 a 的取Apqpqpq值范围23.在四棱锥 PABCD 中,PA面 ABCD,DAB=90,AB 平行于 CD,AD=CD=2AB=2,E,F 分别为 PC,CD 的中点(1)求证:AB面 BEF(2)设 PA=h,若二面角 E-BDC 大于 45,求 h的取值范围- 4 -参考答案:1-6DBCBAA 7-12 DADABB 13. 14.768 15. 16.301a317.(1)A=60(2)S= 7318.当 a1 时,解集为 ;当 a=1 时,解集为 ;当 a1 时,解集2(,)(,)1a(2,)为 (2,)1a19.(1) (2)n12nnT20.(1) (2)3na()34nS21.(1)展开合并再用正弦定理即可(2) ,此时min23u7cos8B22.(1)4(2) (0,1,)23.(1)略(2) 5,

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