河南省洛陽市2022-2023學(xué)年高二上學(xué)期期末考試?yán)砜茢?shù)學(xué)試題(含答案詳解)_第1頁
河南省洛陽市2022-2023學(xué)年高二上學(xué)期期末考試?yán)砜茢?shù)學(xué)試題(含答案詳解)_第2頁
河南省洛陽市2022-2023學(xué)年高二上學(xué)期期末考試?yán)砜茢?shù)學(xué)試題(含答案詳解)_第3頁
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洛陽市2022+2023學(xué)年第一學(xué)期期末考試高二數(shù)學(xué)試卷(理)本試卷共4頁,共150分.考試時(shí)間120分鐘.注意事項(xiàng):1.答卷前,考生務(wù)必將自己的姓名、考號填寫在答題卡上.2.考試結(jié)束,將答題卡交回.一、選擇題:本大題共12小題,每小題5分,共60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.若直線SKIPIF1<0經(jīng)過點(diǎn)SKIPIF1<0和SKIPIF1<0,則直線l的傾斜角為()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】【分析】由斜率公式求出直線SKIPIF1<0的斜率,利用傾斜角與斜率的關(guān)系求解.【詳解】設(shè)直線SKIPIF1<0的斜率為SKIPIF1<0,且傾斜角為SKIPIF1<0,則SKIPIF1<0,則SKIPIF1<0,而SKIPIF1<0,故SKIPIF1<0,故選:D.2.已知數(shù)列SKIPIF1<0,則6是這個(gè)數(shù)列的()A.第6項(xiàng) B.第12項(xiàng) C.第18項(xiàng) D.第36項(xiàng)【答案】C【解析】【分析】利用數(shù)列的通項(xiàng)公式求解.【詳解】數(shù)列SKIPIF1<0的通項(xiàng)公式為SKIPIF1<0,令SKIPIF1<0解得SKIPIF1<0,故選:C.3.若雙曲線的漸近線方程是SKIPIF1<0,虛軸長為4,且焦點(diǎn)在x軸上,則雙曲線的標(biāo)準(zhǔn)方程為()A.SKIPIF1<0或SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】C【解析】【分析】根據(jù)雙曲線的性質(zhì)求解.【詳解】由題可得SKIPIF1<0解得SKIPIF1<0,所以雙曲線的標(biāo)準(zhǔn)方程為SKIPIF1<0.故選:C.4.如圖,線段AB,BD在平面SKIPIF1<0內(nèi),SKIPIF1<0,SKIPIF1<0,且SKIPIF1<0,則C,D兩點(diǎn)間的距離為()A.19 B.17 C.15 D.13【答案】D【解析】【分析】根據(jù)線面垂直的性質(zhì)定理結(jié)合勾股定理求解.【詳解】連接SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,又因?yàn)镾KIPIF1<0,SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,故選:D.5.“SKIPIF1<0”是“曲線SKIPIF1<0表示橢圓”的()A.充分而不必要條件 B.必要而不充分條件C.充要條件 D.既不充分也不必要條件【答案】B【解析】【分析】根據(jù)曲線表示橢圓,可求得t范圍,根據(jù)充分、必要條件的定義,即可得答案.【詳解】因?yàn)榍€SKIPIF1<0為橢圓,所以SKIPIF1<0,解得SKIPIF1<0且SKIPIF1<0,所以“SKIPIF1<0”是“SKIPIF1<0且SKIPIF1<0”的必要而不充分條件.故選:B6.設(shè)SKIPIF1<0,向量SKIPIF1<0,且SKIPIF1<0,則SKIPIF1<0()A.SKIPIF1<0 B.SKIPIF1<0 C.3 D.9【答案】A【解析】【分析】由向量的關(guān)系列方程求解SKIPIF1<0的值,結(jié)合向量的模的公式計(jì)算得出結(jié)果.【詳解】向量SKIPIF1<0,且SKIPIF1<0,∴SKIPIF1<0,解得SKIPIF1<0,∴SKIPIF1<0∴SKIPIF1<0,∴SKIPIF1<0.故選:A.7.如果實(shí)數(shù)x,y滿足SKIPIF1<0,則SKIPIF1<0的取值范圍是()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【解析】【分析】SKIPIF1<0表示SKIPIF1<0上的點(diǎn)SKIPIF1<0與點(diǎn)SKIPIF1<0連線的斜率,畫出圖形即可求解.【詳解】SKIPIF1<0表示圓心為SKIPIF1<0,半徑為SKIPIF1<0的圓,SKIPIF1<0表示SKIPIF1<0上的點(diǎn)SKIPIF1<0與點(diǎn)SKIPIF1<0連線的斜率.易知直線SKIPIF1<0平行SKIPIF1<0軸,且SKIPIF1<0當(dāng)直線SKIPIF1<0為圓SKIPIF1<0的切線時(shí),SKIPIF1<0,SKIPIF1<0,故SKIPIF1<0,此時(shí)直線SKIPIF1<0的斜率為1,由對稱性及圖形可得SKIPIF1<0.故選:A.8.設(shè)拋物線SKIPIF1<0,點(diǎn)SKIPIF1<0為SKIPIF1<0上一點(diǎn),過點(diǎn)SKIPIF1<0作SKIPIF1<0軸于點(diǎn)SKIPIF1<0,若點(diǎn)SKIPIF1<0,則SKIPIF1<0的最小值為()A.SKIPIF1<0 B.SKIPIF1<0 C.4 D.5【答案】B【解析】【分析】首先得到拋物線的焦點(diǎn)坐標(biāo)與準(zhǔn)線方程,由拋物線的定義可知SKIPIF1<0,則SKIPIF1<0,即可得解.【詳解】拋物線SKIPIF1<0的焦點(diǎn)為SKIPIF1<0,準(zhǔn)線方程為SKIPIF1<0,由拋物線的定義可知SKIPIF1<0,所以SKIPIF1<0,當(dāng)且僅當(dāng)SKIPIF1<0、SKIPIF1<0、SKIPIF1<0三點(diǎn)共線(SKIPIF1<0SKIPIF1<0之間)時(shí)取等號.故選:B9.某牧場今年年初牛的存欄數(shù)為1200,預(yù)計(jì)以后每年存欄數(shù)的增長率為SKIPIF1<0,且在每年年底賣出100頭牛,牧場從今年起每年年初的計(jì)劃存欄數(shù)構(gòu)成數(shù)列SKIPIF1<0,即SKIPIF1<0,則SKIPIF1<0大約為()(參考數(shù)據(jù):SKIPIF1<0)A.1429 B.1472 C.1519 D.1571【答案】B【解析】【分析】由題意得數(shù)列SKIPIF1<0遞推公式,再用構(gòu)造法求出通項(xiàng),代入計(jì)算即可.【詳解】由題可知SKIPIF1<0,設(shè)SKIPIF1<0,解得SKIPIF1<0.即SKIPIF1<0,故數(shù)列SKIPIF1<0是首項(xiàng)為SKIPIF1<0,公比為1.1的等比數(shù)列.所以SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0.故選:B.10.過定點(diǎn)M的直線SKIPIF1<0與過定點(diǎn)N的直線SKIPIF1<0交于點(diǎn)A(A與M,N不重合),則SKIPIF1<0面積的最大值為()A.SKIPIF1<0 B.SKIPIF1<0 C.8 D.16【答案】C【解析】【分析】根據(jù)題意分析可得點(diǎn)A在以SKIPIF1<0為直徑的圓上,結(jié)合圓的性質(zhì)求SKIPIF1<0面積的最大值.【詳解】對于直線SKIPIF1<0,即SKIPIF1<0,可得直線SKIPIF1<0過定點(diǎn)SKIPIF1<0,對于直線SKIPIF1<0,即SKIPIF1<0,可得直線SKIPIF1<0過定點(diǎn)SKIPIF1<0,∵SKIPIF1<0,則直線SKIPIF1<0與直線SKIPIF1<0垂直,即SKIPIF1<0,∴點(diǎn)A在以SKIPIF1<0為直徑的圓上,且SKIPIF1<0,由圓的性質(zhì)可知:SKIPIF1<0面積的最大值為SKIPIF1<0.故選:C.11.已知數(shù)列SKIPIF1<0滿足SKIPIF1<0,且SKIPIF1<0,則數(shù)列SKIPIF1<0的前18項(xiàng)和為()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】【分析】利用數(shù)列SKIPIF1<0的遞推公式,結(jié)合累乘法,求得其通項(xiàng)公式,根據(jù)三角函數(shù)的計(jì)算,求得數(shù)列SKIPIF1<0的周期,整理數(shù)列SKIPIF1<0的通項(xiàng)公式,利用分組求和,可得答案.【詳解】由SKIPIF1<0,則SKIPIF1<0,即SKIPIF1<0,顯然SKIPIF1<0,滿足公式,即SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0;當(dāng)SKIPIF1<0時(shí),SKIPIF1<0;當(dāng)SKIPIF1<0時(shí),SKIPIF1<0;當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0;當(dāng)SKIPIF1<0時(shí),SKIPIF1<0;則數(shù)列SKIPIF1<0是以SKIPIF1<0為周期的數(shù)列,由SKIPIF1<0,則SKIPIF1<0,設(shè)數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和為SKIPIF1<0,SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0.故選:D.12.已知SKIPIF1<0是雙曲線SKIPIF1<0的左、右焦點(diǎn),O為坐標(biāo)原點(diǎn),以SKIPIF1<0為直徑的圓與雙曲線C的一個(gè)交點(diǎn)為A,以SKIPIF1<0為直徑的圓與雙曲線C的一個(gè)交點(diǎn)為B,若SKIPIF1<0,A,B恰好共線,則雙曲線C的離心率為()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.3【答案】B【解析】【分析】設(shè)SKIPIF1<0,在SKIPIF1<0中,根據(jù)余弦定理可得SKIPIF1<0,根據(jù)三角形面積公式可得SKIPIF1<0,設(shè)SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0,從而可得SKIPIF1<0,SKIPIF1<0,代入SKIPIF1<0,結(jié)合SKIPIF1<0及離心率公式即可求解.【詳解】設(shè)SKIPIF1<0,因?yàn)镾KIPIF1<0在雙曲線上,故SKIPIF1<0.由余弦定理可得SKIPIF1<0SKIPIF1<0,所以SKIPIF1<0.所以SKIPIF1<0.由題意可得SKIPIF1<0與SKIPIF1<0為直角三角形,所以SKIPIF1<0.因?yàn)镾KIPIF1<0是SKIPIF1<0的中點(diǎn),所以SKIPIF1<0是SKIPIF1<0的中點(diǎn).設(shè)SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0.所以SKIPIF1<0SKIPIF1<0.故SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0.所以SKIPIF1<0,解得SKIPIF1<0,SKIPIF1<0.所以SKIPIF1<0,可得SKIPIF1<0,故SKIPIF1<0.故選:B.二、填空題:本大題共4小題,每小題5分,共20分.13.直線SKIPIF1<0與直線SKIPIF1<0之間的距離為_____________.【答案】SKIPIF1<0【解析】【分析】確定兩直線是平行直線,故可根據(jù)平行線間的距離公式求得答案.【詳解】直線SKIPIF1<0可化為SKIPIF1<0,則直線SKIPIF1<0與直線SKIPIF1<0平行,故直線SKIPIF1<0與直線SKIPIF1<0之間的距離為SKIPIF1<0,故答案為:SKIPIF1<0.14.設(shè)SKIPIF1<0、SKIPIF1<0分別在正方體SKIPIF1<0的棱SKIPIF1<0、SKIPIF1<0上,且SKIPIF1<0,SKIPIF1<0,則直線SKIPIF1<0與SKIPIF1<0所成角的余弦值為_____________.【答案】SKIPIF1<0【解析】【分析】以SKIPIF1<0為坐標(biāo)原點(diǎn),建立空間直角坐標(biāo)系,利用向量法能求出直線SKIPIF1<0與SKIPIF1<0所成角的余弦值.【詳解】SKIPIF1<0、SKIPIF1<0分別在正方體SKIPIF1<0的棱SKIPIF1<0、SKIPIF1<0上,且SKIPIF1<0,SKIPIF1<0,如圖以SKIPIF1<0為坐標(biāo)原點(diǎn),建立空間直角坐標(biāo)系,設(shè)SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,設(shè)直線SKIPIF1<0與SKIPIF1<0所成角為SKIPIF1<0,則直線SKIPIF1<0與SKIPIF1<0所成角的余弦值SKIPIF1<0.故答案為:SKIPIF1<0.15.已知SKIPIF1<0,SKIPIF1<0是橢圓SKIPIF1<0:SKIPIF1<0(SKIPIF1<0)的左,右焦點(diǎn),A是橢圓SKIPIF1<0的左頂點(diǎn),點(diǎn)SKIPIF1<0在過A且斜率為SKIPIF1<0的直線上,SKIPIF1<0為等腰三角形,SKIPIF1<0,則橢圓SKIPIF1<0的離心率為______.【答案】SKIPIF1<0##0.5【解析】【分析】結(jié)合圖像,得到SKIPIF1<0,再在SKIPIF1<0中,求得SKIPIF1<0,SKIPIF1<0,從而得到SKIPIF1<0,代入直線SKIPIF1<0可得到SKIPIF1<0,由此可求得橢圓SKIPIF1<0的離心率.【詳解】由題意知SKIPIF1<0,直線SKIPIF1<0的方程為:SKIPIF1<0,由SKIPIF1<0為等腰三角形,SKIPIF1<0,得SKIPIF1<0,過SKIPIF1<0作SKIPIF1<0垂直于SKIPIF1<0軸,如圖,則在SKIPIF1<0中,SKIPIF1<0,故SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0,即SKIPIF1<0,代入直線SKIPIF1<0,得SKIPIF1<0,即SKIPIF1<0,所以所求的橢圓離心率為SKIPIF1<0.故答案為:SKIPIF1<0..16.首項(xiàng)為正數(shù),公差不為0的等差數(shù)列SKIPIF1<0,其前n項(xiàng)和為SKIPIF1<0,現(xiàn)有下列4個(gè)命題:①SKIPIF1<0也是等差數(shù)列;②數(shù)列SKIPIF1<0也是等差數(shù)列;③若SKIPIF1<0,則SKIPIF1<0時(shí),SKIPIF1<0最大;④若SKIPIF1<0的項(xiàng)數(shù)為奇數(shù),其中所有奇數(shù)項(xiàng)的和為290,所有偶數(shù)項(xiàng)的和為261,則此數(shù)列的項(xiàng)數(shù)是19.其中所有真命題的序號是_____________.【答案】②③④【解析】【分析】對①,由等差中項(xiàng)性質(zhì)判斷;對②,求出數(shù)列SKIPIF1<0的通項(xiàng)公式即可判斷;對③,由SKIPIF1<0結(jié)合解析式化簡得SKIPIF1<0,由SKIPIF1<0定義即可判斷;對④,設(shè)項(xiàng)數(shù)為SKIPIF1<0,根據(jù)求和公式列方程組解得參數(shù),即可判斷.【詳解】設(shè)數(shù)列SKIPIF1<0的公差為d,SKIPIF1<0,首項(xiàng)為SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0,對①,SKIPIF1<0SKIPIF1<0,∴SKIPIF1<0不是等差數(shù)列,①錯(cuò);對②,SKIPIF1<0,則數(shù)列SKIPIF1<0為首項(xiàng)SKIPIF1<0,公差為SKIPIF1<0的等差數(shù)列,②對;對③,∵SKIPIF1<0,SKIPIF1<0,∴SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,∴由SKIPIF1<0定義可知,SKIPIF1<0時(shí),SKIPIF1<0最大,③對;對④,由題意可設(shè)SKIPIF1<0的項(xiàng)數(shù)為SKIPIF1<0,則所有奇數(shù)項(xiàng)組成的數(shù)列為首項(xiàng)SKIPIF1<0,公差SKIPIF1<0,項(xiàng)數(shù)為SKIPIF1<0的等差數(shù)列,故所有奇數(shù)項(xiàng)的和為SKIPIF1<0,所有偶數(shù)項(xiàng)組成的數(shù)列為首項(xiàng)SKIPIF1<0,公差SKIPIF1<0,項(xiàng)數(shù)為SKIPIF1<0的等差數(shù)列,故所有偶數(shù)項(xiàng)的和為SKIPIF1<0.兩式相除得SKIPIF1<0,∴數(shù)列的項(xiàng)數(shù)是19,④對.故答案為:②③④.三、解答題:本大題共6個(gè)小題,共70分.解答應(yīng)寫出必要的文字說明、證明過程或演算步驟.17.已知SKIPIF1<0是數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和,且SKIPIF1<0,SKIPIF1<0,設(shè)SKIPIF1<0.(1)若SKIPIF1<0是等比數(shù)列,求SKIPIF1<0;(2)若SKIPIF1<0是等差數(shù)列,求SKIPIF1<0的前SKIPIF1<0項(xiàng)和SKIPIF1<0,【答案】(1)SKIPIF1<0(2)SKIPIF1<0【解析】【分析】(1)由等比數(shù)列的通項(xiàng)公式的求法求解即可;(2)由等差數(shù)列的通項(xiàng)公式的求法,結(jié)合公式法求數(shù)列的前SKIPIF1<0項(xiàng)和即可.【小問1詳解】解:已知SKIPIF1<0是數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和,且SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0,又SKIPIF1<0是等比數(shù)列,設(shè)公比為SKIPIF1<0,則SKIPIF1<0,即SKIPIF1<0;【小問2詳解】解:已知SKIPIF1<0是等差數(shù)列,設(shè)公差為SKIPIF1<0,又SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0,則SKIPIF1<0,即SKIPIF1<0,則SKIPIF1<0,則SKIPIF1<0,則SKIPIF1<0,即SKIPIF1<0的前SKIPIF1<0項(xiàng)和SKIPIF1<0.18.在平面直角坐標(biāo)系SKIPIF1<0中,已知圓M的圓心在直線SKIPIF1<0上,且圓M與直線SKIPIF1<0相切于點(diǎn)SKIPIF1<0.(1)求圓M的方程;(2)過SKIPIF1<0直線l被圓M截得的弦長為SKIPIF1<0,求直線l的方程.【答案】(1)SKIPIF1<0(2)SKIPIF1<0或SKIPIF1<0【解析】【分析】(1)根據(jù)已知得出點(diǎn)SKIPIF1<0與直線SKIPIF1<0垂直的直線方程,根據(jù)圓切線的性質(zhì)得出該直線過圓心,與已知過圓心方程聯(lián)立即可得出圓心坐標(biāo),根據(jù)圓心到切線的距離得出圓的半徑,即可得出圓的方程;(2)根據(jù)弦長得出點(diǎn)SKIPIF1<0到直線l的距離,分類討論直線l的斜率,設(shè)出方程,利用點(diǎn)到直線的距離列式,即可得出答案.【小問1詳解】過點(diǎn)SKIPIF1<0與直線SKIPIF1<0垂直的直線方程為:SKIPIF1<0,即SKIPIF1<0則直線SKIPIF1<0過圓心,SKIPIF1<0解得SKIPIF1<0,即圓心為SKIPIF1<0,則半徑為SKIPIF1<0,則圓M的方程為:SKIPIF1<0;【小問2詳解】過SKIPIF1<0直線l被圓M截得的弦長為SKIPIF1<0,則點(diǎn)SKIPIF1<0到直線l的距離SKIPIF1<0,若直線l的斜率不存在,則方程為SKIPIF1<0,此時(shí)圓心到直線l的距離為1,不符合題意;若直線l的斜率存在,設(shè)直線l的方程為:SKIPIF1<0,則SKIPIF1<0,解得SKIPIF1<0,則直線l的方程為:SKIPIF1<0或SKIPIF1<0.19.如圖,SKIPIF1<0和SKIPIF1<0所在平面垂直,且SKIPIF1<0.(1)求證:SKIPIF1<0;(2)若SKIPIF1<0,求平面SKIPIF1<0和平面SKIPIF1<0的夾角的余弦值.【答案】(1)見解析;(2)SKIPIF1<0.【解析】【分析】(1)取SKIPIF1<0的中點(diǎn)SKIPIF1<0,可得SKIPIF1<0,根據(jù)SKIPIF1<0可得SKIPIF1<0,由線面垂直的判定定理及性質(zhì)定理可證明;(2)作SKIPIF1<0于點(diǎn)SKIPIF1<0,以點(diǎn)SKIPIF1<0為原點(diǎn),SKIPIF1<0所在直線分別為SKIPIF1<0軸建立空間坐標(biāo)系,求出兩個(gè)平面的法向量即可求解.【小問1詳解】取SKIPIF1<0的中點(diǎn)SKIPIF1<0,連接SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0.因SKIPIF1<0為公共邊,所以SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0.因?yàn)镾KIPIF1<0平面SKIPIF1<0,所以SKIPIF1<0平面SKIPIF1<0,因?yàn)镾KIPIF1<0平面SKIPIF1<0,所以SKIPIF1<0.【小問2詳解】當(dāng)SKIPIF1<0,可設(shè)SKIPIF1<0,作SKIPIF1<0于點(diǎn)SKIPIF1<0,連接SKIPIF1<0,易證SKIPIF1<0兩兩垂直,以點(diǎn)SKIPIF1<0為原點(diǎn),SKIPIF1<0所在直線分別為SKIPIF1<0軸建立空間坐標(biāo)系,則SKIPIF1<0,設(shè)平面SKIPIF1<0的法向量為SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0,令SKIPIF1<0,可得SKIPIF1<0,則SKIPIF1<0.易知SKIPIF1<0平面SKIPIF1<0,所以平面SKIPIF1<0的法向量為SKIPIF1<0,設(shè)平面SKIPIF1<0和平面SKIPIF1<0的夾角為SKIPIF1<0,則SKIPIF1<0,故平面SKIPIF1<0和平面SKIPIF1<0的夾角的余弦值為SKIPIF1<0.20.已知直線SKIPIF1<0與拋物線SKIPIF1<0交于A,B兩點(diǎn).(1)若SKIPIF1<0,直線SKIPIF1<0的斜率為1,且過拋物線C的焦點(diǎn),求線段AB的長;(2)若SKIPIF1<0交AB于SKIPIF1<0,求p的值.【答案】(1)8;(2)SKIPIF1<0.【解析】【分析】(1)焦點(diǎn)為SKIPIF1<0,直線SKIPIF1<0的方程為SKIPIF1<0,聯(lián)立直線與拋物線的方程,根據(jù)弦長公式即可求解;(2)設(shè)直線SKIPIF1<0的方程為SKIPIF1<0,根據(jù)題意可得SKIPIF1<0,且SKIPIF1<0在直線SKIPIF1<0上,從而可得直線SKIPIF1<0的方程為SKIPIF1<0,聯(lián)立直線與拋物線的方程,根據(jù)韋達(dá)定理可得SKIPIF1<0,代入SKIPIF1<0即可求解.【小問1詳解】若SKIPIF1<0,則拋物線SKIPIF1<0,焦點(diǎn)為SKIPIF1<0,故直線SKIPIF1<0的方程為SKIPIF1<0.設(shè)SKIPIF1<0,聯(lián)立SKIPIF1<0,消去SKIPIF1<0,可得SKIPIF1<0,SKIPIF1<0,故SKIPIF1<0.故SKIPIF1<0.【小問2詳解】設(shè)直線SKIPIF1<0的方程為SKIPIF1<0,SKIPIF1<0,因?yàn)镾KIPIF1<0交AB于SKIPIF1<0,所以SKIPIF1<0,且SKIPIF1<0,所以SKIPIF1<0,直線SKIPIF1<0的方程為SKIPIF1<0.又SKIPIF1<0在直線SKIPIF1<0上,所以SKIPIF1<0,解得SKIPIF1<0.所以直線SKIPIF1<0的方程為SKIPIF1<0.由SKIPIF1<0,消去SKIPIF1<0,可得SKIPIF1<0,則SKIPIF1<0.因?yàn)?/p>

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