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金華十校2022-2023學(xué)年第一學(xué)期調(diào)研考試高二數(shù)學(xué)試題卷本試卷分選擇題和非選擇題兩部分.考試時(shí)間120分鐘.試卷總分為150分.請(qǐng)考生按規(guī)定用筆將所有試題的答案涂、寫(xiě)在答題紙上.選擇題部分(共60分)一、選擇題:本題共8小題,每小題5分,共40分在每小題給出的四個(gè)選項(xiàng)中,只有一項(xiàng)是符合題目要求的.1.直線SKIPIF1<0的傾斜角為()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】C【解析】【分析】先求出直線的斜率,再求直線的傾斜角.【詳解】∵直線SKIPIF1<0x+y﹣2SKIPIF1<00的斜率kSKIPIF1<0,設(shè)傾斜角為SKIPIF1<0,則tanSKIPIF1<0=SKIPIF1<0∴直線SKIPIF1<0x+y﹣2=0傾斜角為SKIPIF1<0.故選C.【點(diǎn)睛】本題考查直線的傾斜角的求法,熟記斜率與傾斜角的關(guān)系是關(guān)鍵,是基礎(chǔ)題2.已知空間向量SKIPIF1<0,SKIPIF1<0,若SKIPIF1<0與SKIPIF1<0垂直,則n為()A.0 B.1 C.2 D.SKIPIF1<0【答案】A【解析】【分析】根據(jù)向量垂直得出數(shù)量積零,即可列式解出答案.【詳解】SKIPIF1<0與SKIPIF1<0垂直,SKIPIF1<0,解得SKIPIF1<0,故選:A.3.已知拋物線SKIPIF1<0的焦點(diǎn)為F,過(guò)C上一點(diǎn)P作拋物線準(zhǔn)線的垂線,垂足為Q,若SKIPIF1<0是邊長(zhǎng)為4的正三角形,則SKIPIF1<0()A.1 B.2 C.3 D.4【答案】B【解析】【分析】根據(jù)SKIPIF1<0是邊長(zhǎng)為4的正三角形及拋物線定義求出SKIPIF1<0點(diǎn)橫坐標(biāo),進(jìn)而求得SKIPIF1<0點(diǎn)坐標(biāo),即可求得SKIPIF1<0點(diǎn)坐標(biāo),根據(jù)SKIPIF1<0,用兩點(diǎn)間的距離公式代入計(jì)算即可.【詳解】由題知SKIPIF1<0,因?yàn)镾KIPIF1<0是邊長(zhǎng)為4的正三角形,所以SKIPIF1<0,根據(jù)拋物線定義可知SKIPIF1<0,即SKIPIF1<0,所以SKIPIF1<0,故SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,解得:SKIPIF1<0.故選:B4.圓SKIPIF1<0,圓SKIPIF1<0,則兩圓的公切線有()A.0條 B.1條 C.2條 D.3條【答案】B【解析】【分析】由圓心距與半徑的關(guān)系判斷兩圓位置關(guān)系,后可得答案.【詳解】圓SKIPIF1<0,圓心為SKIPIF1<0,半徑SKIPIF1<0.圓SKIPIF1<0,圓心為SKIPIF1<0,半徑SKIPIF1<0.注意到圓心距SKIPIF1<0,則兩圓相內(nèi)切,故公切線條數(shù)為1.故選:B5.桁架橋指的是以桁架作為上部結(jié)構(gòu)主要承重構(gòu)件的橋梁.桁架橋一般由主橋架、上下水平縱向聯(lián)結(jié)系、橋門(mén)架和中間橫撐架以及橋面系組成.下面是某桁架橋模型的一段,它是由一個(gè)正方體和一個(gè)直三棱柱構(gòu)成.其中SKIPIF1<0,那么直線AH與直線IG所成角的余弦值為()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】【分析】建立空間直角坐標(biāo)系,利用空間向量求解異面直線的夾角余弦值.【詳解】以E為坐標(biāo)原點(diǎn),EB,ED,EI所在直線分別為x軸,y軸,z軸,建立空間直角坐標(biāo)系,設(shè)SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0,設(shè)直線AH與直線IG所成角為SKIPIF1<0,則SKIPIF1<0,故直線AH與直線IG所成角的余弦值為SKIPIF1<0.故選:D6.小芳“雙SKIPIF1<0”以分期付款的方式購(gòu)買(mǎi)一臺(tái)標(biāo)價(jià)SKIPIF1<0元的筆記本電腦,購(gòu)買(mǎi)當(dāng)天付了SKIPIF1<0元,以后的八個(gè)月,每月SKIPIF1<0日小芳需向商家支付SKIPIF1<0元分期款,并加付當(dāng)月所有欠款產(chǎn)生的一個(gè)月的利息(月利率為SKIPIF1<0),若SKIPIF1<0月算分期付款的首月,則第SKIPIF1<0個(gè)月小芳需要給商家支付()A.550元 B.560元 C.570元 D.580元【答案】B【解析】【分析】準(zhǔn)確理解題意,代入數(shù)據(jù)計(jì)算即可.【詳解】第3個(gè)月小芳需要給商家支付SKIPIF1<0元.故選:B.7.有以下三條軌跡:①已知圓SKIPIF1<0,圓SKIPIF1<0,動(dòng)圓P與圓A內(nèi)切,與圓B外切,動(dòng)圓圓心P的運(yùn)動(dòng)軌跡記為SKIPIF1<0;②已知點(diǎn)A,B分別是x,y軸上的動(dòng)點(diǎn),O是坐標(biāo)原點(diǎn),滿足SKIPIF1<0,AB,AO的中點(diǎn)分別為M,N,MN的中點(diǎn)為P,點(diǎn)P的運(yùn)動(dòng)軌跡記為SKIPIF1<0;③已知SKIPIF1<0,點(diǎn)P滿足PA,PB的斜率之積為SKIPIF1<0,點(diǎn)P的運(yùn)動(dòng)軌跡記為SKIPIF1<0.設(shè)曲線SKIPIF1<0的離心率分別是SKIPIF1<0,則()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【解析】【分析】根據(jù)題意,分別求出三個(gè)曲線方程,并求出對(duì)應(yīng)的離心率即可求解.【詳解】①,設(shè)動(dòng)圓圓心SKIPIF1<0,半徑為SKIPIF1<0,由題意可知:圓SKIPIF1<0的圓心坐標(biāo)SKIPIF1<0,半徑SKIPIF1<0;圓SKIPIF1<0的圓心坐標(biāo)SKIPIF1<0,半徑SKIPIF1<0;由條件可知:SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0,所以點(diǎn)SKIPIF1<0的軌跡方程為:SKIPIF1<0,則SKIPIF1<0;②設(shè)SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0,由中點(diǎn)坐標(biāo)公式可得:SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0的中點(diǎn)SKIPIF1<0,因?yàn)镾KIPIF1<0,所以點(diǎn)SKIPIF1<0的坐標(biāo)滿足SKIPIF1<0,也即SKIPIF1<0:SKIPIF1<0,所以SKIPIF1<0;③設(shè)點(diǎn)SKIPIF1<0,由題意可知:SKIPIF1<0,整理化簡(jiǎn)可得:SKIPIF1<0,所以SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0,故選:SKIPIF1<0.8.已知數(shù)列SKIPIF1<0是各項(xiàng)為正數(shù)的等比數(shù)列,公比為q,在SKIPIF1<0之間插入1個(gè)數(shù),使這3個(gè)數(shù)成等差數(shù)列,記公差為SKIPIF1<0,在SKIPIF1<0之間插入2個(gè)數(shù),使這4個(gè)數(shù)成等差數(shù)列,公差為SKIPIF1<0,在SKIPIF1<0之間插入n個(gè)數(shù),使這SKIPIF1<0個(gè)數(shù)成等差數(shù)列,公差為SKIPIF1<0,則()A.當(dāng)SKIPIF1<0時(shí),數(shù)列SKIPIF1<0單調(diào)遞減 B.當(dāng)SKIPIF1<0時(shí),數(shù)列SKIPIF1<0單調(diào)遞增C.當(dāng)SKIPIF1<0時(shí),數(shù)列SKIPIF1<0單調(diào)遞減 D.當(dāng)SKIPIF1<0時(shí),數(shù)列SKIPIF1<0單調(diào)遞增【答案】D【解析】【分析】根據(jù)數(shù)列SKIPIF1<0的定義,求出通項(xiàng),由通項(xiàng)討論數(shù)列的單調(diào)性.【詳解】數(shù)列SKIPIF1<0是各項(xiàng)為正數(shù)的等比數(shù)列,則公比為SKIPIF1<0,由題意SKIPIF1<0,得SKIPIF1<0,SKIPIF1<0時(shí),SKIPIF1<0,有SKIPIF1<0,SKIPIF1<0,數(shù)列SKIPIF1<0單調(diào)遞增,A選項(xiàng)錯(cuò)誤;SKIPIF1<0時(shí),SKIPIF1<0,SKIPIF1<0,若數(shù)列SKIPIF1<0單調(diào)遞增,則SKIPIF1<0,即SKIPIF1<0,由SKIPIF1<0,需要SKIPIF1<0,故B選項(xiàng)錯(cuò)誤;SKIPIF1<0時(shí),SKIPIF1<0,解得SKIPIF1<0,SKIPIF1<0時(shí),SKIPIF1<0,由SKIPIF1<0,若數(shù)列SKIPIF1<0單調(diào)遞減,則SKIPIF1<0,即SKIPIF1<0,而SKIPIF1<0不能滿足SKIPIF1<0恒成立,C選項(xiàng)錯(cuò)誤;SKIPIF1<0時(shí),SKIPIF1<0,解得SKIPIF1<0或SKIPIF1<0,由AB選項(xiàng)的解析可知,數(shù)列SKIPIF1<0單調(diào)遞增,D選項(xiàng)正確.故選:D【點(diǎn)睛】思路點(diǎn)睛:此題的入手點(diǎn)在于求數(shù)列SKIPIF1<0的通項(xiàng),根據(jù)SKIPIF1<0的定義求得通項(xiàng),再討論單調(diào)性.二、選擇題:本題共4小題,每小題5分,共20分.在每小題給出的選項(xiàng)中,有多項(xiàng)符合題目要求全部選對(duì)的得5分,有選錯(cuò)的得0分,部分選對(duì)的得2分.9.已知雙曲線SKIPIF1<0,則()A.漸近線方程為SKIPIF1<0 B.焦點(diǎn)坐標(biāo)是SKIPIF1<0 C.離心率為SKIPIF1<0 D.實(shí)軸長(zhǎng)為4【答案】ABD【解析】【分析】由雙曲線方程求雙曲線,焦點(diǎn)坐標(biāo),離心率,實(shí)軸長(zhǎng).【詳解】由雙曲線方程為:SKIPIF1<0,焦點(diǎn)在SKIPIF1<0軸,所以SKIPIF1<0,所以漸近線方程為SKIPIF1<0,故A正確,焦點(diǎn)坐標(biāo)為SKIPIF1<0,故B正確,離心率為:SKIPIF1<0,故C錯(cuò)誤,實(shí)軸長(zhǎng)為:SKIPIF1<0,故D正確,故選:ABD.10.自然界中存在一個(gè)神奇的數(shù)列,比如植物一年生長(zhǎng)新枝的數(shù)目,某些花朵的花數(shù),具有1,1,2,3,5,8,13,21……,這樣的規(guī)律,從第三項(xiàng)開(kāi)始每一項(xiàng)都是前兩項(xiàng)的和,這個(gè)數(shù)列稱(chēng)為斐波那爽數(shù)列.設(shè)數(shù)列SKIPIF1<0為斐波那契數(shù)列,則有SKIPIF1<0,以下是等差數(shù)列的為()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】BD【解析】【分析】利用定義構(gòu)造等差中項(xiàng)來(lái)驗(yàn)證所給選項(xiàng)成等差數(shù)列.詳解】由題意:SKIPIF1<0,①所以SKIPIF1<0,②②SKIPIF1<0①得:SKIPIF1<0,所以數(shù)列SKIPIF1<0或數(shù)列SKIPIF1<0成等差數(shù)列,令SKIPIF1<0,則SKIPIF1<0成等差數(shù)列,故B正確,A錯(cuò)誤,由SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0成等差數(shù)列,令SKIPIF1<0,則SKIPIF1<0成等差數(shù)列,故D正確,C錯(cuò)誤.故選:BD.11.已知平行六面體SKIPIF1<0的所有棱長(zhǎng)都為1,SKIPIF1<0,設(shè)SKIPIF1<0.()A.若SKIPIF1<0,則直線SKIPIF1<0平面SKIPIF1<0B.若SKIPIF1<0,則平面SKIPIF1<0平面SKIPIF1<0C.若SKIPIF1<0,則直線SKIPIF1<0平面SKIPIF1<0D.若SKIPIF1<0,則平面SKIPIF1<0平面ABCD【答案】BC【解析】【分析】根據(jù)空間向量數(shù)量積的運(yùn)算和空間中線面垂直,面面垂直的判定逐項(xiàng)檢驗(yàn)即可求解.【詳解】對(duì)于SKIPIF1<0,若SKIPIF1<0,SKIPIF1<0SKIPIF1<0SKIPIF1<0,所以SKIPIF1<0與SKIPIF1<0不垂直,又因?yàn)镾KIPIF1<0平面SKIPIF1<0,所以直線SKIPIF1<0與平面SKIPIF1<0不垂直,故選項(xiàng)SKIPIF1<0錯(cuò)誤;對(duì)于SKIPIF1<0,若SKIPIF1<0,則SKIPIF1<0,又因?yàn)镾KIPIF1<0,且SKIPIF1<0平面SKIPIF1<0,所以SKIPIF1<0平面SKIPIF1<0,又因?yàn)镾KIPIF1<0平面SKIPIF1<0,所以平面SKIPIF1<0平面SKIPIF1<0,故選項(xiàng)SKIPIF1<0正確;對(duì)于SKIPIF1<0,若SKIPIF1<0,因?yàn)镾KIPIF1<0SKIPIF1<0,所以SKIPIF1<0,又因?yàn)镾KIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0,所以SKIPIF1<0,因?yàn)镾KIPIF1<0,SKIPIF1<0平面SKIPIF1<0,所以直線SKIPIF1<0平面SKIPIF1<0,故選項(xiàng)SKIPIF1<0正確;對(duì)于SKIPIF1<0,如圖:連接SKIPIF1<0,取SKIPIF1<0的中點(diǎn)SKIPIF1<0,連接SKIPIF1<0.若SKIPIF1<0,由題意可知:SKIPIF1<0,根據(jù)題意可知:SKIPIF1<0,則SKIPIF1<0即為平面SKIPIF1<0與平面SKIPIF1<0所成的二面角的平面角或其補(bǔ)角,由題意可知:SKIPIF1<0,在SKIPIF1<0中,由余弦定理可得:SKIPIF1<0,所以平面SKIPIF1<0與平面SKIPIF1<0所成的二面角的平面角不是直角,所以平面SKIPIF1<0與平面SKIPIF1<0不垂直,故選項(xiàng)SKIPIF1<0錯(cuò)誤.故選:SKIPIF1<0.12.已知橢圓SKIPIF1<0的左右焦點(diǎn)分別為SKIPIF1<0,過(guò)SKIPIF1<0的直線交橢圓于SKIPIF1<0兩點(diǎn),設(shè)SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,已知SKIPIF1<0成等差數(shù)列,公差為d,則()A.SKIPIF1<0成等差數(shù)列 B.若SKIPIF1<0,則SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】ABC【解析】【分析】A選項(xiàng),由橢圓定義及SKIPIF1<0成等差數(shù)列,得到SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,故SKIPIF1<0,A正確;B選項(xiàng),在A選項(xiàng)基礎(chǔ)上得到SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,設(shè)出直線SKIPIF1<0的方程,與橢圓方程聯(lián)立,得到兩根之和,兩根之積,由SKIPIF1<0得到SKIPIF1<0,由弦長(zhǎng)公式得到SKIPIF1<0,聯(lián)立得到SKIPIF1<0;C選項(xiàng),由焦半徑公式推導(dǎo)出SKIPIF1<0,C正確;D選項(xiàng),在SKIPIF1<0的基礎(chǔ)上,得到SKIPIF1<0,D錯(cuò)誤.【詳解】A選項(xiàng),由橢圓定義可知:SKIPIF1<0,又SKIPIF1<0成等差數(shù)列,故SKIPIF1<0,則SKIPIF1<0,則SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0,又SKIPIF1<0,故SKIPIF1<0,故A正確;B選項(xiàng),若SKIPIF1<0,此時(shí)SKIPIF1<0,SKIPIF1<0,故SKIPIF1<0,且SKIPIF1<0,設(shè)SKIPIF1<0,因?yàn)橹本€SKIPIF1<0斜率一定不為0,設(shè)直線SKIPIF1<0為SKIPIF1<0,與SKIPIF1<0聯(lián)立得:SKIPIF1<0,即SKIPIF1<0則SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,聯(lián)立解得SKIPIF1<0,故SKIPIF1<0由弦長(zhǎng)公式可得:SKIPIF1<0,所以SKIPIF1<0,平方得:SKIPIF1<0,其中SKIPIF1<0,故SKIPIF1<0,解得:SKIPIF1<0,即SKIPIF1<0,由SKIPIF1<0可得:SKIPIF1<0,整理得:SKIPIF1<0,即SKIPIF1<0,故SKIPIF1<0,解得:SKIPIF1<0或SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0舍去,故SKIPIF1<0,B正確;C選項(xiàng),設(shè)橢圓SKIPIF1<0上一點(diǎn)SKIPIF1<0,其中橢圓左右焦點(diǎn)分別為SKIPIF1<0,下面證明SKIPIF1<0,SKIPIF1<0,過(guò)點(diǎn)M作MA⊥橢圓的左準(zhǔn)線于點(diǎn)A,作MB⊥橢圓右準(zhǔn)線于點(diǎn)B,則有橢圓的第二定義可知:SKIPIF1<0,其中SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0,故SKIPIF1<0,故SKIPIF1<0,SKIPIF1<0,故SKIPIF1<0,所以SKIPIF1<0,C正確;D選項(xiàng),設(shè)直線SKIPIF1<0為SKIPIF1<0,由SKIPIF1<0得:SKIPIF1<0,故SKIPIF1<0,D錯(cuò)誤.故選:ABC【點(diǎn)睛】橢圓焦半徑公式:(1)橢圓SKIPIF1<0上一點(diǎn)SKIPIF1<0,其中橢圓左右焦點(diǎn)分別為SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0,(2)橢圓SKIPIF1<0上一點(diǎn)SKIPIF1<0,其中橢圓下上焦點(diǎn)分別為SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0,記憶口訣:左加右減,下加上減.非選擇題部分(共90分)三、填空題:本題共4小題,每小題5分,共20分.13.直線SKIPIF1<0,直線SKIPIF1<0,則SKIPIF1<0之間距離是___________.【答案】SKIPIF1<0##SKIPIF1<0【解析】【分析】根據(jù)兩平行線間的距離公式即可求解.【詳解】由平行線間的距離公式可得:SKIPIF1<0之間的距離是SKIPIF1<0,故答案為:SKIPIF1<0.14.數(shù)列SKIPIF1<0滿足SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0___________.【答案】SKIPIF1<0【解析】【分析】累加法以及等差數(shù)列求和公式求數(shù)列的通項(xiàng)公式.【詳解】因?yàn)镾KIPIF1<0,所以SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,累加得:SKIPIF1<0SKIPIF1<0故答案為:SKIPIF1<0.15.老張家的庭院形狀如圖,中間部分是矩形ABCD,SKIPIF1<0(單位:m),一邊是以CD為直徑的半圓,另外一邊是以AB為長(zhǎng)軸的半個(gè)橢圓,且橢圓的一個(gè)頂點(diǎn)M到AB的距離是SKIPIF1<0,要在庭院里種兩棵樹(shù),想讓兩棵樹(shù)距離盡量遠(yuǎn),請(qǐng)你幫老張計(jì)算一下,這個(gè)庭院里相距最遠(yuǎn)的兩點(diǎn)間距離是___________m.【答案】SKIPIF1<0##SKIPIF1<0【解析】【分析】根據(jù)題意建立平面直角坐標(biāo)系,求出橢圓上的點(diǎn)到圓心距離的最大值,再加上半徑即可求得結(jié)果.【詳解】根據(jù)題意可得,以SKIPIF1<0的中點(diǎn)SKIPIF1<0為坐標(biāo)原點(diǎn),SKIPIF1<0所在直線和SKIPIF1<0的垂直平分線分別為SKIPIF1<0軸建立如下圖所示的平面直角坐標(biāo)系,則半圓圓心為SKIPIF1<0,半徑SKIPIF1<0;由橢圓長(zhǎng)軸SKIPIF1<0可得SKIPIF1<0,易知SKIPIF1<0,所以橢圓方程為SKIPIF1<0;根據(jù)題意可得當(dāng)SKIPIF1<0點(diǎn)到圓心SKIPIF1<0的距離最大時(shí),SKIPIF1<0的連線交半圓于SKIPIF1<0,此時(shí)SKIPIF1<0距離最大;設(shè)SKIPIF1<0,則SKIPIF1<0,易知SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0取最大值28,所以SKIPIF1<0,則SKIPIF1<0.故答案為:SKIPIF1<016.如圖,已知平行四邊形SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0、SKIPIF1<0分別是SKIPIF1<0、SKIPIF1<0的中點(diǎn).現(xiàn)將四邊形SKIPIF1<0沿著直線SKIPIF1<0向上翻折,則在翻折過(guò)程中,當(dāng)點(diǎn)SKIPIF1<0到直線SKIPIF1<0的距離為SKIPIF1<0時(shí),二面角SKIPIF1<0的余弦值為_(kāi)___________.【答案】SKIPIF1<0【解析】【分析】連接SKIPIF1<0、SKIPIF1<0,取SKIPIF1<0的中點(diǎn)SKIPIF1<0,連接SKIPIF1<0、SKIPIF1<0,推導(dǎo)出SKIPIF1<0平面SKIPIF1<0,可知SKIPIF1<0,以點(diǎn)SKIPIF1<0為坐標(biāo)原點(diǎn),SKIPIF1<0、SKIPIF1<0所在直線分別為SKIPIF1<0、SKIPIF1<0軸,平面SKIPIF1<0內(nèi)過(guò)點(diǎn)SKIPIF1<0且與平面SKIPIF1<0的垂線為SKIPIF1<0軸建立空間直角坐標(biāo)系,利用空間向量法結(jié)合點(diǎn)到直線的距離公式可求得SKIPIF1<0的值,即為所求.【詳解】連接SKIPIF1<0、SKIPIF1<0,取SKIPIF1<0的中點(diǎn)SKIPIF1<0,連接SKIPIF1<0、SKIPIF1<0,易知SKIPIF1<0,且SKIPIF1<0,則四邊形SKIPIF1<0為菱形,易知SKIPIF1<0,則四邊形SKIPIF1<0為等邊三角形,所以,SKIPIF1<0,同理可知SKIPIF1<0,所以,二面角SKIPIF1<0的平面角為SKIPIF1<0,因?yàn)镾KIPIF1<0,SKIPIF1<0、SKIPIF1<0平面SKIPIF1<0,所以,SKIPIF1<0平面SKIPIF1<0,且SKIPIF1<0,以點(diǎn)SKIPIF1<0為坐標(biāo)原點(diǎn),SKIPIF1<0、SKIPIF1<0所在直線分別為SKIPIF1<0、SKIPIF1<0軸,平面SKIPIF1<0內(nèi)過(guò)點(diǎn)SKIPIF1<0且與平面SKIPIF1<0的垂直的直線為SKIPIF1<0軸建立如圖所示的空間直角坐標(biāo)系,則SKIPIF1<0、SKIPIF1<0、SKIPIF1<0、SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,所以點(diǎn)SKIPIF1<0到直線SKIPIF1<0的距離為SKIPIF1<0SKIPIF1<0,解得SKIPIF1<0.故答案為:SKIPIF1<0.四、解答題:本題共6小題,共70分.解答應(yīng)寫(xiě)出文字說(shuō)明、證明過(guò)程或演算步驟.17.已知等差數(shù)列SKIPIF1<0,正項(xiàng)等比數(shù)列SKIPIF1<0,其中SKIPIF1<0的前n項(xiàng)和記為SKIPIF1<0,滿足SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.(1)求數(shù)列SKIPIF1<0,SKIPIF1<0的通項(xiàng)公式;(2)若SKIPIF1<0,求數(shù)列SKIPIF1<0的前n項(xiàng)和SKIPIF1<0.【答案】(1)SKIPIF1<0,SKIPIF1<0(2)SKIPIF1<0【解析】【分析】(1)根據(jù)數(shù)列類(lèi)型和基本量關(guān)系的運(yùn)算即可求得通項(xiàng)公式;(2)利用錯(cuò)位相減法即可求得結(jié)果.【小問(wèn)1詳解】設(shè)等差數(shù)列SKIPIF1<0的公差為SKIPIF1<0,等比數(shù)列SKIPIF1<0的公比為SKIPIF1<0;利用基本量運(yùn)算有SKIPIF1<0,因?yàn)镾KIPIF1<0為正項(xiàng)數(shù)列,可得SKIPIF1<0,所以SKIPIF1<0;即數(shù)列SKIPIF1<0的通項(xiàng)公式為SKIPIF1<0數(shù)列SKIPIF1<0通項(xiàng)公式為SKIPIF1<0小問(wèn)2詳解】由(1)可得SKIPIF1<0,所以SKIPIF1<0①SKIPIF1<0②SKIPIF1<0得:SKIPIF1<0SKIPIF1<0即數(shù)列SKIPIF1<0的前n項(xiàng)和SKIPIF1<018.圓SKIPIF1<0經(jīng)過(guò)點(diǎn)SKIPIF1<0與直線SKIPIF1<0相切,圓心SKIPIF1<0的橫、縱坐標(biāo)滿足SKIPIF1<0.(1)求圓SKIPIF1<0的標(biāo)準(zhǔn)方程;(2)直線SKIPIF1<0交圓SKIPIF1<0于A,B兩點(diǎn),當(dāng)SKIPIF1<0時(shí),求直線l的方程.【答案】(1)SKIPIF1<0(2)SKIPIF1<0【解析】【分析】(1)待定系數(shù)法求圓的方程.(2)直線與圓相交,求出弦長(zhǎng)建立等式關(guān)系,求得SKIPIF1<0,進(jìn)而求得直線方程.【小問(wèn)1詳解】設(shè)圓心坐標(biāo)為SKIPIF1<0SKIPIF1<0,有SKIPIF1<0.得SKIPIF1<0或SKIPIF1<0(舍),所以SKIPIF1<0.【小問(wèn)2詳解】直線截圓所得弦長(zhǎng)SKIPIF1<0,而圓半徑SKIPIF1<0,因此圓心SKIPIF1<0到直線SKIPIF1<0距離為SKIPIF1<0所以SKIPIF1<0,得SKIPIF1<0.從而直線l的方程SKIPIF1<0.19.已知直線l過(guò)拋物線SKIPIF1<0的焦點(diǎn)F,與拋物線SKIPIF1<0交于SKIPIF1<0兩點(diǎn).(1)若SKIPIF1<0的傾斜角為SKIPIF1<0,求SKIPIF1<0;(2)若在拋物線SKIPIF1<0上有且僅有一點(diǎn)SKIPIF1<0(異于SKIPIF1<0),使得SKIPIF1<0,求直線l的方程和相應(yīng)點(diǎn)SKIPIF1<0的坐標(biāo).【答案】(1)SKIPIF1<0(2)直線SKIPIF1<0方程為SKIPIF1<0相應(yīng)的點(diǎn)SKIPIF1<0或直線SKIPIF1<0方程為SKIPIF1<0相應(yīng)的點(diǎn)SKIPIF1<0【解析】【分析】(1)根據(jù)條件求出直線方程,與拋物線方程聯(lián)立,利用韋達(dá)定理可求得弦長(zhǎng).(2)設(shè)直線SKIPIF1<0與拋物線聯(lián)立,韋達(dá)定理得SKIPIF1<0兩點(diǎn)坐標(biāo)關(guān)系,SKIPIF1<0,SKIPIF1<0,化簡(jiǎn)可得SKIPIF1<0,有且只有一個(gè)解,判別式為SKIPIF1<0,可求得結(jié)果.【小問(wèn)1詳解】因?yàn)橹本€SKIPIF1<0過(guò)焦點(diǎn)SKIPIF1<0且傾斜角為SKIPIF1<0,故方程為SKIPIF1<0,與SKIPIF1<0聯(lián)立消去y,得SKIPIF1<0,設(shè)點(diǎn)SKIPIF1<0,由韋達(dá)定理得SKIPIF1<0,所以SKIPIF1<0.【小問(wèn)2詳解】設(shè)直線SKIPIF1<0方程為SKIPIF1<0,聯(lián)立方程組SKIPIF1<0,消去SKIPIF1<0得SKIPIF1<0,所以SKIPIF1<0設(shè)點(diǎn)SKIPIF1<0直線SKIPIF1<0的斜率分別為SKIPIF1<0,由SKIPIF1<0得SKIPIF1<0,因?yàn)镾KIPIF1<0,同理SKIPIF1<0所以SKIPIF1<0,化簡(jiǎn)得SKIPIF1<0即SKIPIF1<0,由已知方程只有一個(gè)解,故判別式SKIPIF1<0所以直線SKIPIF1<0方程為SKIPIF1<0相應(yīng)的點(diǎn)SKIPIF1<0或直線SKIPIF1<0方程為SKIPIF1<0相應(yīng)的點(diǎn)SKIPIF1<020.在四棱錐SKIPIF1<0中,SKIPIF1<0,PD與平面SKIPIF1<0所成角的大小為SKIPIF1<0,點(diǎn)Q為線段SKIPIF1<0上一點(diǎn).(1)若SKIPIF1<0平面SKIPIF1<0,求SKIPIF1<0的值;(2)若四面體SKIPIF1<0的體積為SKIPIF1<0,求直線SKIPIF1<0與平面SKIPIF1<0所成角的大?。敬鸢浮?1)SKIPIF1<0(2)SKIPIF1<0【解析】【分析】(1)過(guò)點(diǎn)Q作SKIPIF1<0交SKIPIF1<0于E,連接SKIPIF1<0.證明四邊形SKIPIF1<0是平行四邊形,即可求得SKIPIF1<0的值;(2)過(guò)P作SKIPIF1<0交SKIPIF1<0的延長(zhǎng)線于O,證明SKIPIF1<0平面SKIPIF1<0.從而建立空間直角坐標(biāo)系,求得相關(guān)點(diǎn)坐標(biāo),求出平面SKIPIF1<0的法向量,利用空間角的向量求法,即可求得答案.【小問(wèn)1詳解】過(guò)點(diǎn)Q作SKIPIF1<0交SKIPIF1<0于E,連接SKIPIF1<0.SKIPIF1<0,SKIPIF1<0四邊形SKIPIF1<0是平面四邊形又SKIPIF1<0平面SKIPIF1<0平面SKIPIF1<0,SKIPIF1<0平面PAD,SKIPIF1<0平面SKIPIF1<0,SKIPIF1<0,SKIPIF1<0四邊形SKIPIF1<0是平行四邊形,SKIPIF1<0,而SKIPIF1<0,于是SKIPIF1<0.【小問(wèn)2詳解】過(guò)P作SKIPIF1<0交SKIPIF1<0的延長(zhǎng)線于O,SKIPIF1<0,而SKIPIF1<0;又SKIPIF1<0與平面SKIPIF1<0所成角的大小為SKIPIF1<0,則P到平面SKIPIF1<0的距離為SKIPIF1<0,即SKIPIF1<0的長(zhǎng)為P到平面SKIPIF1<0的距離,SKIPIF1<0平面SKIPIF1<0.以O(shè)為原點(diǎn),SKIPIF1<0所在直線分別為x軸,y軸,z軸,如圖建立空間直角坐標(biāo)系.SKIPIF1<0,設(shè)四面體SKIPIF1<0的高為h,由于SKIPIF1<0,所以SKIPIF1<0,即SKIPIF1<0,所以SKIPIF1<0.于是SKIPIF1<0,SKIPIF1<0,設(shè)平面SKIPIF1<0的一個(gè)法向量為SKIPIF1<0,則SKIPIF1<0,即SKIPIF1<0,令SKIPIF1<0,得SKIPIF1<0,又SKIPIF1<0,設(shè)直線SKIPIF1<0與平面SKIPIF1<0所成角為SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0,所以直線SKIPIF1<0與平面SKIPIF1<0所成角的大小為SKIPIF1<0.21.已知數(shù)列SKIPIF1<0的前n項(xiàng)和為SKIPIF1<0,且SKIPIF1<0,SKIPIF1<0,SKIPIF1<0成等比數(shù)列.(1)若SKIPIF1<0為等差數(shù)列,求SKIPIF1<0;(2)令SKIPIF1<0,是否存在正整數(shù)k,使得SKIPIF1<0是SKIPIF1<0與SKIPIF1<0的等比中項(xiàng)?若存n+2在,求出所有滿足條件的SKIPIF1<0和k,若不存在,請(qǐng)說(shuō)明理由.【答案】(1)SKIPIF1<0(2)存在;SKIPIF1<0或SKIPIF1<0【解析】【分析】(1)方法一:利用已知條件求出數(shù)列的通項(xiàng)公式,然后根據(jù)數(shù)列SKIPIF1<0為等差數(shù)列求解即可,方法二:利用已知條件先求出SKIPIF1<0;(2)由(1)結(jié)合已知條件建立方程,解出方程進(jìn)行分析即可.【小問(wèn)1詳解】由已知得:SKIPIF1<0,方法一:當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,兩式相減的SKIPIF1<0,因?yàn)镾KIPIF1<0,所以當(dāng)SKIPIF1<0時(shí),SKIPIF1<0.又由SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0.若SKIPIF1<0為等差數(shù)列,則SKIPIF1<0,所以公差SKIPIF1<0,則SKIPIF1<0.方法二:由SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0.當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,又SKIPIF1<0,且數(shù)列SKIPIF1<0為等差數(shù)列,所以得SKIPIF1<0.則SKIPIF1<0,符合題意,所以SKIPIF1<0.【小問(wèn)2詳解】令SKIPIF1<0,則SKIPIF1<0,由SKIPIF1<0得SKIPIF1<0,化簡(jiǎn)得SKIPIF1<0.令SKIPIF1<0,則SKIPIF1<0解得SKIPIF1<0或SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0無(wú)解,SKIPIF1<0得:SKIPIF1<0或SKIPIF1<0.22.已知雙曲線SKIPIF1<0,斜率為1的直線過(guò)雙曲線C上一點(diǎn)SKIPIF1<0交該曲線于另一點(diǎn)B,且線段
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