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浙江省新阵地教育联盟2024届第二次联考数学答案第1页共6页浙江省新阵地教育联盟2024届第二次联考数学参考答案一、选择题题号123456789101112答案BACCBBDCCDBDACDBCD三、填空题13.5614.25215.2316.2四、解答题1
7.(1)证:找AC中点O,连接BO,SO...............(1)........................................................1,.......................
............................................BABCBOACRtSABRtSBCBABCSBSBRtSABRtSCBSASC=⊥===分在与中........
.2.............(2)12SOAC⊥⊥⊥分由()()知:AC平面SOB.....................3分ACSB.......................................4分222222222
12,0),2,0),2,0)....................................................522,23,22,,),(2)8(2)12(2)8SASBSCSxyzxyzxyz
xyz⊥===+++=−+++=+−+=()过点O作OZ平面ABC.由()知,建立如图空间坐标系o-xyz,如图:则A(0,-B(,0C(0,分设(得:202(202(2,2,),(2,2,0),(22,0,2)2xyzSASBCBS
=−==−=−=−=−解得,,)..............................................6分,0(2,2,0)00(22,0,2)0mBCSmBCmBSm⊥==−==−=设平面且(a,b,c)(a,b,
c)(a,b,c)0220abmac−==−=取(1,1,)............................7分{#{QQABQQQAogioAAAAAQgCQwESCgIQkAECAAoGgFAAoAAAwQNABAA=}#}浙江
省新阵地教育联盟2024届第二次联考数学答案第2页共6页,0(2,2,0)020(2,2,2)00nBCDndedefn⊥=−=−=−−=−==同理:设平面且(d,e,f)(d,e,f)(d,e,f
)取(1,1,)..........................................8分02cos,....................................92||||
45.......................10mnmnmnSBCD==−−分二面角夹角为分18.解22112tantantancoscos2cossinsinsincossincossin2cossinsinsinsin2cossin
sinsinsin2cossinsin.........................................................32cos3BCABCABCABCCBABCAAABCAAABCabcAA+=+=+=====即分2222222..
.......................................................................................42cos.......................
...........................................abcabcbcAabcbcbcbc==+−=+−==分又...........................5...
.......................................................................................63B=分分22222222(
2)sin2cossinsin222...........................................................................................7AABCbcaa
bcbcbca=+−=+=分{#{QQABQQQAogioAAAAAQgCQwESCgIQkAECAAoGgFAAoAAAwQNABAA=}#}浙江省新阵地教育联盟2024届第二次联考数学答案第3
页共6页2222222222221(21(2cos)...........................................................941(2)421(22)4ADABACADbcbcAbcaADbcbc
bcbca=+=+++−=++=+−又)...................................8分分2.....................................................................
....1133443............................................................................................122aAD===分分19.解:(1)'()1aaxfxxx−=−=,0x.
.................................1分当0a时,'()0fx,则()fx在(0,)+上单调递减........................2分当0a时,令'()0axfxx−==,解得xa
=.当0xa时,'()0fx,则()fx在(0,)a上单调递增.....................3分当xa时,'()0fx,则()fx在(,)a+上单调递减.......................4分综上:
当0a时,()fx在(0,)+上单调递减;当0a时,()fx在(0,)a上单调递增,()fx在(,)a+上单调递减......................................................
...........5分(2)由(1)得:max()()(ln)fxfaaaaa==−−........................6分要证:()32fxa−+,即证:2ln220(0)aaaaa−+−...............7分
即证:2ln20aaa−−+............................................8分令2()ln20)gaaaaa=−−+(,2(2)(1)'()aagaa−+=......................9分当02a时,'(
)0ga,则()ga在(0,2)上单调递增;................10分当2a时,'()0ga,则()ga在(2,)+上单调递减;..................11分所以,max()(2)ln210gag==−
从而命题得证........................................................................................12分20.解:1111111221
12211221..................................................................................1.......(1)22.......(2)22(2n
nnnnnnnabbaabababnabababnnabn+−−===+++=−++++=−+=(1)当n=1时,,分)两式相减得:2(2nnnnab)设数列的公差为d,数列的公比为q.则{#{QQABQQQAogioAAAAAQgCQwESCgIQk
AECAAoGgFAAoAAAwQNABAA=}#}浙江省新阵地教育联盟2024届第二次联考数学答案第4页共6页22(1).(2)81.....................................432(12)(2246dqddqdqq+===−=+=
=解得或分)442131,.036..............................................................................................6ddabq=−=+=−=
4nnn当时,a不合题意,舍去..........5分a=n,b=2分11(1)(2).......................................................................................724()(0)..........
.......................................................(1)2nnnnnnnnSSttctnnb−−+===+分111n1.....8(2,)4(1,)....................................
............1042...................4t2[1()]4...........0,4t14mnmmnmmnmnnnncbtmnmNcbcbmnmNtcbntt−++−−−++==−−分数列是以=2为首项
,以为公比的等比数列分原式=............................................................12分21.解:(1)由题意知:241121..54533p=+=.............................
.................................3分11111112(2).(1)....................................................................54352(2,3....16)123858171217828
0176585172,3......16).........81217nnnnnnnnppppnppppnp−−−−−=+−=−+=−=−−−=−=−=−分()又(.................................
.....................58285.1765128285.((1,2,3.......16)..................................................7176512nnppn−−=+−=
n-1分数列是以为首项,以为公比的等比数列)分{#{QQABQQQAogioAAAAAQgCQwESCgIQkAECAAoGgFAAoAAAwQNABAA=}#}浙江省新阵地教育联盟2024届第二次联考数学答案第5页共6页
(3)11(1,2.......16.........................................................................8282851.(1765122565((
1,2.......16)................................123428nnnpppnn−=+−−=n-1n-1由题意知,只需即)分)).................95651234285121.5253,1214425655513(
)14434282418177513351718131817718177nnn===−=−−−=n-1n-12分显然必为奇数,偶数不成立当n=1,3,5.....15时,有()即可................................10分()单调递减,显然成立()0
5625655,12144144342862565512513144144342824723617751301324723617751310124723617751370177236)02472361775.nn==−=−−−−=4故n=3
时成立()与比较大小()()()=(时不成立................................11分5125.2.nn-1又()单调递减时不成立综上,只有晚................................12分{#{QQABQQQAog
ioAAAAAQgCQwESCgIQkAECAAoGgFAAoAAAwQNABAA=}#}浙江省新阵地教育联盟2024届第二次联考数学答案第6页共6页22.(1)由已知得:-------------2分两边平分并化简得:即为曲线的方程.-------------4分(2)设点,.
直线()与双曲线的方程联立,消去得.由韦达定理:,.-------------6分由条件,直线的方程为,直线的方程为,于是可得,-------------8分因为四点共圆,所以,,所以所以,于是.即,化简得-------------10分又,,代入整理得:将韦达定理
代入化简得:.-------------12分2213yx−=,ANOAMOMNOMAO==ANOMNOAMOMAO+=+{#{QQABQQQAogioAAAAAQgCQwESCgIQ
kAECAAoGgFAAoAAAwQNABAA=}#}