山东省青岛市四区统考2023-2024学年高三上学期期中高三数学答案

2023-11-22 · U1 上传 · 4页 · 210.8 K

2023-2024学年度第一学期期中学业水平检测高三数学评分标准一、单项选择题:本题共8小题,每小题5分,共40分。1--8:DAACBCAB二、多项选择题:本题共4小题,每小题5分,共20分。(选不全得2分)9.BCD10.AC11.BCD12.ABD三、填空题:本题共4个小题,每小题5分,共20分。(16题第一个空2分,第二个空3分)13.ye3x;14.6;15.3;16.(1)14;(2)2.四、解答题:本题共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)因为CDPA,CDAD,PAADA,所以CD平面PAD····················································································3分又因为CD平面ABCD,所以平面ABCD平面PAD···································4分(2)记AD中点为F,因为PAPD,所以PFAD····································5分又因为平面ABCD平面PADAD,所以PF平面ABCD···························6分故以F为坐标原点,分别以FM,FD,FP所在射线为x轴,y轴,z轴,建立如图空间直角坐标系,所以P(0,0,2),M(2,0,0),D(0,2,0),C(2,2,0),···············································7分设平面的法向量为,PDMn1(x1,y1,z1)zn1PD02y12z10则,,2x2z0Pn1PM011令,可得分z11n1(1,1,1)··················8设平面的法向量为PCDn2(x2,y2,z2)n2PC02x22y22z20FD则,,A2y2z0yn2PD022令,可得分z21n2(0,1,1)················9BC设平面PDM与平面PCD夹角为,Mx|nn|26则,12分cos|cosn1n2|·············································10|n1||n2|6318.(12分)解:(1)因为sin2Asin2B4sinAsinBcosC0,由正弦定理知:a2b24abcosC①···························································2分又由余弦定理知:c2a2b22abcosC②····················································3分c2由①②得:cosC·············································································4分6abc23ab1又因为c23ab,所以cosC··········································5分6ab6ab22π因为c(0,π),所以C········································································6分3ππ5π2π5π14(2)因为T2(),所以,,27775因为N*,所以1或2···································································8分高三数学答案第1页(共4页){#{QQABBQIAogAgABIAARgCEwHiCEKQkBAACKoGAEAIsAAAwAFABCA=}#}12π1若1,则f(x)sin(x),因为f(C),所以sin(),232π2ππ7π因为||,所以(,),所以无解·············································10分236614π1若2,则f(x)sin(2x),因为f(C),所以sin(),232π4π5π11π4π7ππ因为||,所以(,),所以,解得··········11分2366366此时f(x)sin(2x)在(,)上不单调,所以无解······························12分67219.(12分)1解:(1)由题f(x)a,x0································································1分x当a0时,f(x)0,f(x)在(0,)上单调递减;·······································3分1当a0时,由f(x)0解得x································································4分a11所以,当x(0,)时,f(x)0;当x(,)时,f(x)0;aa11所以,f(x)在(0,)上单调递减,在(,)上单调递增;·································6分aa1(2)由(1)知:当a0时,f(x)f()1lna·····································7分minaa2a2所以,存在a0,使1lnab成立,即存在a0,使1lnab成立···8分22a211a2令g(a)1lna,则g(a)a··············································9分2aa所以,g(a)在(0,1)上单调递增,在(1,)上单调递减,···································10分1所以g(a)g(1)···················································································11分21所以b的取值范围为(,]··········································································12分220.(12分)解:(1)因为APBD,PCBD,APPCP,所以BD平面APC········1分所以BDAC····························································································2分因为四边形ABCD是圆柱底面的内接四边形,且AC为其直径所以BEED,ABAD,BCCD,ABCADC90·····························4分又因为ACBCCD,所以AC2BC,1所以在RTABC中,sinBAC,所以BAC302所以BAD60,BAD是等边三角形························································5分(2)因为AC4,由(1)知,在RTABC中,AE3,EC1,所以CE:EA1:3······················································································6分高三数学答案第2页(共4页){#{QQABBQIAogAgABIAARgCEwHiCEKQkBAACKoGAEAIsAAAwAFABCA=}#}因为PF:FA1:3,所以PC//EF又因为PC平面BFD,EF平面BFD,所以PC//平面BFD·····················7分所以点P到平面FBD的距离等于点C到平面FBD的距离···································9分因为CEPC,所以CEEF,又因为CEBD,EFBDE,所以CE平面BFD,···············································································10分所以点C到平面FBD的距离为CE1,点P到平面FBD的距离为1··················12分21.(12分)CDsinACD1解:(1)由题知,在△ACD中,由正弦定理得sinCAD····2分AD2π因为ADCD,所以ACDCAD,所以CAD·································3分6π所以DπACDCAD,所以ADCD········································4分2(2)在△ABC中,AC2··········································································5分AB2BC2AC23由余弦定理知:cosABC·······································6分2ABBC2所以AB2BC243ABBC,所以2ABBC43ABBC4解得:ABBC843,等号当仅当ABBC时取··························7分231所以SABBCsinB23····························································8分ABC25πABAC(3)在△ABC中,设BAC(0,),由正弦定理知:6sinACBsinB5π5π所以AB4sin(),AE2sin()····················································9分66在△ADE中,由余弦定理知:DE2AD2AE22ADAEcosDAE5π5ππ所以DE234sin2()43sin()cos()666πππ34sin2()43sin()cos()666ππππ52cos(2)23sin(2)54sin(2)3336π54sin(2)54cos2(1,9]···········································11分2π所以DE29,等号当仅当BAC时取,所以DE的最大值等于3················12分222.(12分)解:(1)因为f(x)ex2ax1,································································1分设g(x)f(x),则g(x)ex2a,·····························································2分高三数学答案第3页(共4页){#{QQABBQIAogAgABIAARgCEwHiCEKQkBAACKoGAEAIsAAAwAFABCA=}#}当a0时,g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