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数学参考答案第1页(共8页)南平市2023届高中毕业班第三次质量检测数学参考答案及评分标准说明:1.本解答给出了一种或几种解法供参考,如果考生的解法与本解答不同,可根据试题的主要考查内容比照评分标准制定相应的评分细则.2.对
计算题,当考生的解答在某一步出现错误时,如果后继部分的解答未改变该题的内容和难度,可视影响的程度决定后继部分的给分,但不得超过该部分正确解答应给分数的一半;如果后继部分的解答有较严重的错误,就不再给分.3.只给整数分数.选择题和填空题不给中间分.一、选择题:本题考查基础知识和
基本运算,每小题5分,满分40分。1.C2.B3.C4.C5.D6.A7.B8.A二、选择题:本大题共4小题,每小题5分,满分20分.在每小题给出的四个选项中,有多项符合题目要求。全部选对的得5分,部
分选对的得2分,有选错的得0分。9.BD10.ACD11.AC12.BCD三、填空题:本题考查基础知识和基本运算,每小题5分,满分20分。13.2014.(1,1)(答案不唯一)15.2ee0xy16.82π四、解答题:本大题共6小题,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)依题意,{}nnaT是以1为首项,2为公差的等差数列,所以11221nnannT(),..........................
...............................................................................................................................
.........2分即(21)nnnTa,从而当2n≥时,有11(23)nnnTa,.......................................................3分两式相除得,12123nnnnaana,由已知得0n
T,从而0na,所以当2n≥时,121123nnna,即12321nnan,.......................................................
...............5分所以2121nnan.....................................................................................
...............................................6分(2)设{}23nTn的前n项和为nS,由(1)得,21nnaTn,所以121nTn,....
..............7分故123(21)(23)nTnnn111()22123nn,......................................................................8分数学参考答案第2页(共8页)所以
1111111111()()23557212323233(23)nnSnnnn.................10分18.(本小题满分12分)解:(1)依题意得sinsincoscossin
cosBCCBCC,................................................................................................2分所以sinsinsincoscossincoscosBCBCBCB
C,所以sincos0BCBC,...............................................................................
........................4分所以tan1BC即tan1A,....................................................................................
................5分又因为0πA,所以π4A........................................................................
......................................6分(2)由11π2sin224ABCSabc△,.............................................................
......................................7分所以24abc.由余弦定理得222π2cos4abcbc,.............................................
..................................................8分即2222abcbc,所以2222128bcbcbc,即22221228bcbcbcbc≥,......................
.........................10分所以822bc≥,当且仅当bc时取“等号”,..........................................................................11分而1π2sin
244ABCSbcbc△,故min28224244ABCS△....................................12分19.(12分)数学参考答案第3页(共8页)(1)证明:作SO
平面ABC,垂直为O,则SBO为SB与平面ABC所成角,所以3SBO,在RtSBO△中,由4SB可得2BO,23SO.........................................1分因为SO平面ABC,所以
SOCO,所以在RtSCO△中,由26SC,23SO,可得23CO,..............................................2分在BCO△中,由4BC,23CO,2BO,可得222BCCOBO,从而COBO,且
6BCO,.......................................................................................................................
.................3分在ACO△中,4AC,6ACO,所以ACOBCO△△,从而2AOBO,所以4AOBO,又4AB,所以点O必在AB上,且O为AB的中点...........................
................................................................................................................................4分因为SO平面
ABC,所以SOAB,又ABCO,SOCOO,,SOCO平面SCO,所以AB平面SCO,从而SCAB........................................................................................
.........6分(2)解:以点O为坐标原点,,,OCOBOS所在直线分别为zyx,,轴建立如图所示的空间直角坐标系xyzO,....................................
.......................................................................................7分(0,2,0)B,(23,0,0)C,(0,0,23)S,(3,3,0)D,则133()
(,,3)222OMOSOD,即33(,,3)22M...................................................8分37(,,3)22BM,(23,2,0)BC,设平面
BCM的法向量为),,(zyxn,由,,00BCnBMn得.0232032723yxzyx,取3y,可得)4,3,1(n,...................................................
...................................................10分取平面SBC的一个法向量)001(,,m,.............................................................
.......................11分设所求的角为,则105|201||||||||,cos|cosnmnmnm,因此所求平面SBC数学参考答案第4页(共8页)与平面SAD夹角的余弦值为105...............................
......................................................................12分20.(12分)解:(1)因为散点,1,2,,6
iivi集中在一条直线附近,设回归直线方程为ˆˆˆbva,由4.1,3.05v,则1222175.364.13.051ˆ101.464.12niiiniivnvbvnv,..........
.................................2分所以1ˆˆ3.054.112abv,.............................................
........................................................4分所以变量关于v的回归方程为1ˆ12v,令ln,ln,vxy所以1lnln1,2y
x所以12ˆeyx,................................................................6分综上,y关于x的回归方程为12eyx.(2)由1212eeee,97yxxxx,解得498
1x≤≤,所以50,60,65,72x,所以B,C,D,E为“热门套票”,................................................................................................8分则三
人中购买“热门套票”的人数X服从超几何分布,X的可能取值为1,2,3.1221342424333666CCCCC131(1),(2)(3)C5C55,CPXPXPX..............
.......................................10分所以X的分布列为:131()1232555EX...........................................
....................................................12分X123P153515数学参考答案第5页(共8页)21.(12分)解:(1)由题意得2,2()()1,ca
acac...............................................................................................
...................................2分解得2a,1c,所以1b......................................................
..................................................3分椭圆C的方程为2212xy.....................................................
........................................................4分(2)依题意得直线2l的方程为1x.设直线1l的方程为1xmy,1122(,y),(,)PxQxy.由2212xmyxy,=1,得22(2
)210mymy..................................................................................................................5分12222myym
,12212yym,.......................................................................................
...6分所以12122yymyy.1AP的方程为:11(2)2yyxx,由111(2)2xyyxx,,解得11(12)2Myyx...............................................
...................7分2AQ的方程为:22(2)2yyxx,由221,(2),2xyyxx解得22(12)2Nyyx.......................................
...........................8分数学参考答案第6页(共8页)1111122221221(12)(12)||||2(2)21(2)||||(12)(21)22yFNAFSxyxySyxFMAFx..............
..........................10分12112121211221221()(12)(m12)(12)21(m12)(12)()(12)2yyyyymyyyyymyyyyyy......
..........................11分121212123+22322322322322yyyyyyyy322.......................
...................................................................................................................12分22.(12分)解:(1)2()6
exfxa,............................................................................................................
....1分当0a≥时,()0fx,fx单调递增,无极值,........................................................................2分当0a时,由()0fx,得1ln(
)26ax,...................................................................................3分当1(0,ln())26ax时,
'()0fx,函数()fx单调递减;当1(ln(),)26ax时,'()0fx,函数()fx单调递增;所以当1ln()26ax时,函数()fx的极小值为ln()226aaa,无极大值........
..................4分(2)由(1)得ln()3226aaa,令()ln()226aaaa0a,则1'()ln()26aa,由'()0a,得6a,数学参考答案第7页(共8页)当(,6)a时,'()0a,函
数()a单调递增;当(6,0)a时,'()0a,函数()a单调递减;所以当且仅当6a时,函数()a的最大值为3,故由ln()3226aaa,得6a..............................
.................................................................5分不妨设1x2x,当x(0,)时,2'()6(e1)0xfx,fx单调递增;当x(0
,)时,2'()660gxxx,gx单调递增;所以1212|()()||()()|fxfxgxgx≥,可化成2121()()()()fxfxgxgx≥,..............
6分即2211()()()()fxgxfxgx≥,对10x2x恒成立,令232()()()3e236xhxfxgxxxx,x(0,),则()hx在(0,)上单调递增,所以22
'()6e6660xhxxx在(0,)上恒成立,........................................................7分设22()e1xuxxx,则(0)0u,2'()2e2xuxx,'(0)2u,当2
≤时,因为2''()4e2xux在(0,)上单调递增;所以''()''(0)420uxu≥≥,所以2'()2e2xuxx在(0,)上单调递增;所以'()'(0)20uxu≥≥,所以22()e1xuxxx在(0,)上单调递增;所以()(0
)0uxu≥,数学参考答案第8页(共8页)所以'()6()0hxux≥在(0,)上恒成立..................................................................................10分当2
时,令2''()4e20xux,得1ln22x,当1(0,ln)22x时,''()0ux,所以当1(0,ln)22x时函数'()ux单调递减,'()'(0)0uxu,所以当1(0,ln)22x时函数()ux单调递减,()
(0)=0uxu,所以当1(0,ln)22x时'()6()0hxux,矛盾.综上所述,2≤......................................................................................
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