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答案第1页,共4页成都七中高2024届高三上入学考试数学试题理科一、单选题CACADCDBBAAB二、填空题13.,10xxexR14.6715.416.1三、解答题17.【答案】(1)1113444AFAAADAB【详解】(1)
11114AFAEEFADDFDE=111133444ADDBDA=11344ADAB=1113444AAAD
AB;(2)设(ACABAD,不为0),1111EGDGDEkDCkDAkAC=1111()()(
)kABADkABkADkDBDAkDDDA111()()DFDEDHDEEFEH
则EF,EG,EH共面且有公共点E,则,,,EFGH四点共面;18.【答案】(1)0.3pq(2)分布列见解析;期望为7.4【详解】(1)解:分别记“甲租用时间不超过30钟、3040分钟、4050分钟”为事件1
23,,AAA,它们彼此互斥,则1230.4,,PAPApPAq,且0.6pq①;分别记“乙租用时间不超过30钟、3040分钟、4050分钟”为事件123,,BBB,则12
30.5,0.2,0.3PBPBPB,且123,,AAA与123,,BBB相互独立.记“甲、乙租用时间相同”为事件C,则112233112233PCPABABABPAPBPAPBPAPB
0.40.50.20.30.35231.5pqpq②由①②解得:0.3pq(2)解:X可能取值为4,6,8,10,12,40.40.50.2PX,60.40.20.30.50.23PX
,80.40.30.50.3+0.30.20.33PX,100.30.30.30.20.15PX,120.30.30.09PX所以X的分布表如下:{#{QQABbYwEogCgQAJAA
RgCAQUwCgCQkAAAAIgOhAAEoAAByBFABAA=}#}{#{QQABbYwEogCgQAJAARgCAQUwCgCQkAAAAIgOhAAEoAAByBFABAA=}#}答案第3页,共4页2121212121ln(
)()()22axxaxxxxxx21ln2aaaa不妨设212121ln12()ln1(4)2aaaagxgxhaaaaxxa,则112()22ahaaa,因为4a,所以()0ha,所以()ha在(
4,)上递减,所以()(4)2ln23hah,所以2ln23,即实数的取值范围为[2ln23,).21.【答案】(1)22:122xyE(2)直线AD过定点4,03
【详解】(1)设,0Fc,由2ca,则222222cabaa,即ab,所以渐近线方程为yx.又F到双曲线E的渐近线的距离为2,则22c,即2c,2ab.所以双曲线方程为22:
122xyE.(2)设00,Bxy,00,Cxy,直线FB的方程为0022xxyy,直线FB的方程与双曲线22:122xyE联立,2002200242120xxyyyy.又22
002xy,则22000023220xyxyyy所以200023Ayyyx,即0023Ayyx,003423Axxx.同理0023Dyyx,003423Dxxx,则00
00000000000000002323232333434342334232323ADyyyxyxxxykxxxxxxxxx,则直线AD方程为00000034323
23yyxyxxxx,令0y,则000034132323xxxxx,即000000423344323233233xxxxxxx所以直线AD过定点4,03
.{#{QQABbYwEogCgQAJAARgCAQUwCgCQkAAAAIgOhAAEoAAByBFABAA=}#}答案第4页,共4页22.【答案】(1)22148xy2x;当cos0时,直线l的直角坐标方程为tan2ta
nyx,当cos0时,直线l的参数方程为=1x.(2)45【详解】(1)由22222,142.1sxssys得2222222221214811ssxyss,而
24221xs,即曲线C的直角坐标方程为221248xyx,由1cos(2sinxttyt为参数),当cos0时,消去参数t,可得直线l的直角坐标方程为tan2tanyx,当cos
0时,可得直线l的参数方程为=1x.(2)将直线l的参数方程代入曲线C的直角坐标方程,整理可得:22(1cos)4(sincos)20tt.①曲线C截直线l所得线段的中点(1,2)在椭圆内,则方程①有两解,设为1t,2t,则1224cos4sin0
1costt,故cossin0,解得tan1.l的倾斜角为45.23.【答案】(1)3(2)(,4)(2,)【详解】(1)0,0,0abc,则3331313ababab,3331313bcbcbc3331313c
acaca,则333323139abcabbcca,所以3333abc,当且仅当1abc时等号成立,333abc的最小值为3M.(2)1()(1)1xmxxmxm,当且仅当()(1)0xmx且|
||1|xmx时取最大值|1|m.|||1|yxmx的最大值为|1|3m,解得(,4)(2,)m.{#{QQABbYwEogCgQAJAARgCAQUwCgCQkAAAAIgOhAAEoAAByBFABAA=}#}获得更多资源请扫码加入享
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