版權(quán)說(shuō)明:本文檔由用戶(hù)提供并上傳,收益歸屬內(nèi)容提供方,若內(nèi)容存在侵權(quán),請(qǐng)進(jìn)行舉報(bào)或認(rèn)領(lǐng)
文檔簡(jiǎn)介
新高考數(shù)學(xué)考前模擬卷注意事項(xiàng):本試卷滿分150分,考試時(shí)間120分鐘.答卷前,考生務(wù)必用0.5毫米黑色簽字筆將自己的姓名、班級(jí)等信息填寫(xiě)在試卷規(guī)定的位置.單項(xiàng)選擇題(本大題共8小題,每小題5分,共40分)1.若SKIPIF1<0,則SKIPIF1<0()A.3 B.4 C.5 D.62.已知不等式x2-2x-3<0的解集為A,不等式x2+x-6<0的解集為B,不等式x2+ax+b<0的解集是A∩B,那么a+b等于()A.-3 B.1C.-1 D.33.在某場(chǎng)新冠肺炎疫情視頻會(huì)議中,甲?乙?丙?丁?戊五位疫情防控專(zhuān)家輪流發(fā)言,其中甲必須排在前兩位,丙?丁必須排在一起,則這五位專(zhuān)家的不同發(fā)言順序共有()A.8種 B.12種 C.20種 D.24種4.已知角SKIPIF1<0的終邊經(jīng)過(guò)點(diǎn)SKIPIF1<0,則SKIPIF1<0=()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<05.(2020·甘肅省民樂(lè)縣第一中學(xué)高一期中)若SKIPIF1<0,則SKIPIF1<0的取值范圍是()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<06.已知函數(shù)SKIPIF1<0,則不等式SKIPIF1<0的解集為()A.SKIPIF1<0B.SKIPIF1<0C.SKIPIF1<0D.SKIPIF1<07.在SKIPIF1<0中,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0為SKIPIF1<0邊上的高,SKIPIF1<0為SKIPIF1<0的中點(diǎn),若SKIPIF1<0,則SKIPIF1<0的值為()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.18.已知等差數(shù)列SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則數(shù)列SKIPIF1<0的前n項(xiàng)和為()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0多項(xiàng)選擇題(本大題共4小題,每小題5分,共20分.全部選對(duì)的得5分,部分選對(duì)的得3分,有選錯(cuò)的得0分)9.在長(zhǎng)方體SKIPIF1<0中,SKIPIF1<0,SKIPIF1<0,則下列結(jié)論正確的是()A.SKIPIF1<0平面SKIPIF1<0B.平面SKIPIF1<0平面SKIPIF1<0C.三棱錐SKIPIF1<0的體積為8D.直線SKIPIF1<0與平面SKIPIF1<0所成角的正弦值為SKIPIF1<010.某企業(yè)節(jié)能降耗技術(shù)改造后,在生產(chǎn)某產(chǎn)品過(guò)程中記錄的產(chǎn)量SKIPIF1<0(噸)與相應(yīng)的生產(chǎn)能耗SKIPIF1<0(噸)的幾組對(duì)應(yīng)數(shù)據(jù)如表,現(xiàn)發(fā)現(xiàn)表中有個(gè)數(shù)據(jù)看不清,已知回歸直線方程為SKIPIF1<0,下列說(shuō)法正確的是()SKIPIF1<023456SKIPIF1<01925★3844A.看不清的數(shù)據(jù)★的值為34B.回歸直線SKIPIF1<0必經(jīng)過(guò)樣本點(diǎn)(4,★)C.回歸系數(shù)6.3的含義是產(chǎn)量每增加1噸,相應(yīng)的生產(chǎn)能耗實(shí)際增加6.3噸D.據(jù)此模型預(yù)測(cè)產(chǎn)量為7噸時(shí),相應(yīng)的生產(chǎn)能耗為50.9噸11.已知SKIPIF1<0,SKIPIF1<0,且SKIPIF1<0,則下列結(jié)論正確的是()A.SKIPIF1<0的最小值為2 B.當(dāng)SKIPIF1<0均不為1時(shí),SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<012.已知橢圓SKIPIF1<0:SKIPIF1<0(SKIPIF1<0)的左、右焦點(diǎn)分別為SKIPIF1<0,SKIPIF1<0,離心率為SKIPIF1<0,橢圓SKIPIF1<0的上頂點(diǎn)為SKIPIF1<0,且SKIPIF1<0的面積為SKIPIF1<0.雙曲線SKIPIF1<0和橢圓SKIPIF1<0焦點(diǎn)相同,且雙曲線SKIPIF1<0的離心率為SKIPIF1<0,SKIPIF1<0是橢圓SKIPIF1<0與雙曲線SKIPIF1<0的一個(gè)公共點(diǎn),若SKIPIF1<0,則下列說(shuō)法正確的是()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0填空題(本大題共4小題,每小題5分,共20分)13.若命題“SKIPIF1<0”為真命題,則實(shí)數(shù)SKIPIF1<0的取值范圍為_(kāi)_______________________14.已知SKIPIF1<0,則SKIPIF1<0的最小值是_________.15.已知函數(shù)f(x)=cos(ωx+φ)(ω>0,|φ|≤SKIPIF1<0),x=-SKIPIF1<0為f(x)的零點(diǎn),x=SKIPIF1<0為y=f(x)圖象的對(duì)稱(chēng)軸,且f(x)在(SKIPIF1<0,SKIPIF1<0)上單調(diào),則ω的最大值為_(kāi)_____.16.有五個(gè)球編號(hào)分別為SKIPIF1<0號(hào),有五個(gè)盒子編號(hào)分別也為SKIPIF1<0號(hào),現(xiàn)將這五個(gè)球放入這五個(gè)盒子中,每個(gè)盒子放一個(gè)球,則恰有四個(gè)盒子的編號(hào)與球的編號(hào)不同的放法種數(shù)為_(kāi)____(用數(shù)字作答),記SKIPIF1<0為盒子與球的編號(hào)相同的個(gè)數(shù),則隨機(jī)變量SKIPIF1<0的數(shù)學(xué)期望SKIPIF1<0____.四、解答題(本大題共6小題,共70分)17.在①SKIPIF1<0,②SKIPIF1<0,③SKIPIF1<0這三個(gè)條件中任選一個(gè),補(bǔ)充在下面問(wèn)題中,并進(jìn)行求解.問(wèn)題:在SKIPIF1<0中,內(nèi)角SKIPIF1<0,SKIPIF1<0,SKIPIF1<0所對(duì)的邊分別為SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,點(diǎn)SKIPIF1<0,SKIPIF1<0是SKIPIF1<0邊上的兩個(gè)三等分點(diǎn),SKIPIF1<0,______;(1)求SKIPIF1<0的長(zhǎng).(2)求SKIPIF1<0外接圓半徑.18.現(xiàn)某廠商抓住商機(jī)在去年用450萬(wàn)元購(gòu)進(jìn)一批VR設(shè)備,經(jīng)調(diào)試后今年投入使用,計(jì)劃第一年維修、保養(yǎng)費(fèi)用22萬(wàn)元,從第二年開(kāi)始,每年所需維修、保養(yǎng)費(fèi)用比上一年增加4萬(wàn)元,該設(shè)備使用后,每年的總收入為180萬(wàn)元,設(shè)使用SKIPIF1<0年后設(shè)備的盈利額為SKIPIF1<0萬(wàn)元.(1)寫(xiě)出SKIPIF1<0與SKIPIF1<0之間的函數(shù)關(guān)系式;(2)使用若干年后,當(dāng)年平均盈利額達(dá)到最大值時(shí),求該廠商的盈利額.19.某中學(xué)的環(huán)保社團(tuán)參照國(guó)家環(huán)境標(biāo)準(zhǔn)制定了該校所在區(qū)域的空氣質(zhì)量指數(shù)與空氣質(zhì)量等級(jí)對(duì)應(yīng)關(guān)系,如下表(假設(shè)該區(qū)域空氣質(zhì)量指數(shù)不會(huì)超過(guò)300):空氣質(zhì)量指數(shù)SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0空氣質(zhì)量等級(jí)1級(jí)優(yōu)2級(jí)良3級(jí)輕度污染4級(jí)中度污染5級(jí)重度污染6級(jí)嚴(yán)重污染該社團(tuán)將該校區(qū)在2019年100天的空氣質(zhì)量指數(shù)監(jiān)測(cè)數(shù)據(jù)作為樣本,繪制的頻率分布直方圖如圖所示,把該直方圖所得頻率估計(jì)為概率.(1)請(qǐng)估算2019年(以365天計(jì)算)全年空氣質(zhì)量?jī)?yōu)?良的天數(shù)(未滿一天按一天計(jì)算);(2)該校2019年某三天舉行了一場(chǎng)運(yùn)動(dòng)會(huì),若這三天中某天出現(xiàn)5級(jí)重度污染,需要凈化空氣費(fèi)用10000元,出現(xiàn)6級(jí)嚴(yán)重污染,需要凈化空氣費(fèi)用20000元,記這三天凈化空氣總費(fèi)用為SKIPIF1<0元,求SKIPIF1<0的分布列.20.如圖,SKIPIF1<0平面SKIPIF1<0,SKIPIF1<0,點(diǎn)M為BQ的中點(diǎn).(1)求二面角SKIPIF1<0的正弦值;(2)若SKIPIF1<0為線段SKIPIF1<0上的點(diǎn),且直線SKIPIF1<0與平面SKIPIF1<0所成的角為SKIPIF1<0,求線段SKIPIF1<0的長(zhǎng).21.已知函數(shù)SKIPIF1<0.(1)求函數(shù)SKIPIF1<0的單調(diào)區(qū)間;(2)當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,記函數(shù)SKIPIF1<0在SKIPIF1<0上的最大值為SKIPIF1<0,證明:SKIPIF1<0.22.在直角坐標(biāo)系SKIPIF1<0中,橢圓SKIPIF1<0:SKIPIF1<0的離心率為SKIPIF1<0,左、右焦點(diǎn)分別是SKIPIF1<0,SKIPIF1<0,SKIPIF1<0為橢圓SKIPIF1<0上任意一點(diǎn),SKIPIF1<0的最小值為8.(1)求橢圓SKIPIF1<0的方程;(2)設(shè)橢圓SKIPIF1<0:SKIPIF1<0,SKIPIF1<0為橢圓SKIPIF1<0上一點(diǎn),過(guò)點(diǎn)SKIPIF1<0的直線交橢圓SKIPIF1<0于SKIPIF1<0,SKIPIF1<0兩點(diǎn),且SKIPIF1<0為線段SKIPIF1<0的中點(diǎn),過(guò)SKIPIF1<0,SKIPIF1<0兩點(diǎn)的直線交橢圓SKIPIF1<0于SKIPIF1<0,SKIPIF1<0兩點(diǎn).當(dāng)SKIPIF1<0在橢圓SKIPIF1<0上移動(dòng)時(shí),四邊形SKIPIF1<0的面積是否為定值?若是,求出該定值;不是,請(qǐng)說(shuō)明理由.新高考數(shù)學(xué)考前模擬卷注意事項(xiàng):本試卷滿分150分,考試時(shí)間120分鐘.答卷前,考生務(wù)必用0.5毫米黑色簽字筆將自己的姓名、班級(jí)等信息填寫(xiě)在試卷規(guī)定的位置.單項(xiàng)選擇題(本大題共8小題,每小題5分,共40分)1.若SKIPIF1<0,則SKIPIF1<0()A.3 B.4 C.5 D.6【答案】C【詳解】依題意,SKIPIF1<0,則SKIPIF1<0,故選:C2.已知不等式x2-2x-3<0的解集為A,不等式x2+x-6<0的解集為B,不等式x2+ax+b<0的解集是A∩B,那么a+b等于()A.-3 B.1C.-1 D.3【答案】A【詳解】由題意:A={x|-1<x<3},B={x|-3<x<2}.A∩B={x|-1<x<2},由根與系數(shù)的關(guān)系可知:a=-1,b=-2,∴a+b=-3.故選:A.3.在某場(chǎng)新冠肺炎疫情視頻會(huì)議中,甲?乙?丙?丁?戊五位疫情防控專(zhuān)家輪流發(fā)言,其中甲必須排在前兩位,丙?丁必須排在一起,則這五位專(zhuān)家的不同發(fā)言順序共有()A.8種 B.12種 C.20種 D.24種【答案】C【詳解】當(dāng)甲排在第一位時(shí),共有SKIPIF1<0種發(fā)言順序,當(dāng)甲排在第二位時(shí),共有SKIPIF1<0種發(fā)言順序,所以一共有SKIPIF1<0種不同的發(fā)言順序.故選:C.4.已知角SKIPIF1<0的終邊經(jīng)過(guò)點(diǎn)SKIPIF1<0,則SKIPIF1<0=()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【詳解】角SKIPIF1<0的終邊經(jīng)過(guò)點(diǎn)SKIPIF1<0,則SKIPIF1<0所以SKIPIF1<0所以SKIPIF1<0故選:D5.(2020·甘肅省民樂(lè)縣第一中學(xué)高一期中)若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】B【詳解】由題意,SKIPIF1<0且SKIPIF1<0,所以SKIPIF1<0即SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,解得SKIPIF1<0.故選:B.6.已知函數(shù)SKIPIF1<0,則不等式SKIPIF1<0的解集為()A.SKIPIF1<0B.SKIPIF1<0C.SKIPIF1<0D.SKIPIF1<0【答案】C【詳解】函數(shù)SKIPIF1<0的定義域?yàn)镾KIPIF1<0,且SKIPIF1<0,∴SKIPIF1<0為偶函數(shù),當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,由SKIPIF1<0和SKIPIF1<0在SKIPIF1<0上單調(diào)遞增.所以SKIPIF1<0在SKIPIF1<0上單調(diào)遞增.由SKIPIF1<0可得SKIPIF1<0,即SKIPIF1<0,所以SKIPIF1<0,解得:SKIPIF1<0或SKIPIF1<0又因?yàn)镾KIPIF1<0,解得SKIPIF1<0不等式SKIPIF1<0的解集為:SKIPIF1<0故選:C7.在SKIPIF1<0中,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0為SKIPIF1<0邊上的高,SKIPIF1<0為SKIPIF1<0的中點(diǎn),若SKIPIF1<0,則SKIPIF1<0的值為()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.1【答案】A【詳解】∵SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,∴SKIPIF1<0,∴SKIPIF1<0,又SKIPIF1<0是SKIPIF1<0中點(diǎn),∴SKIPIF1<0,而SKIPIF1<0,∴SKIPIF1<0,∴SKIPIF1<0.故選:A.8.已知等差數(shù)列SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則數(shù)列SKIPIF1<0的前n項(xiàng)和為()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【詳解】設(shè)等差數(shù)列SKIPIF1<0的首項(xiàng)為SKIPIF1<0,公差為SKIPIF1<0,∵SKIPIF1<0,SKIPIF1<0,∴SKIPIF1<0,∴SKIPIF1<0,∴SKIPIF1<0,則SKIPIF1<0,∴數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和為SKIPIF1<0;故選:B.多項(xiàng)選擇題(本大題共4小題,每小題5分,共20分.全部選對(duì)的得5分,部分選對(duì)的得3分,有選錯(cuò)的得0分)9.在長(zhǎng)方體SKIPIF1<0中,SKIPIF1<0,SKIPIF1<0,則下列結(jié)論正確的是()A.SKIPIF1<0平面SKIPIF1<0B.平面SKIPIF1<0平面SKIPIF1<0C.三棱錐SKIPIF1<0的體積為8D.直線SKIPIF1<0與平面SKIPIF1<0所成角的正弦值為SKIPIF1<0【答案】AC【詳解】對(duì)于A,因?yàn)镾KIPIF1<0,SKIPIF1<0平面SKIPIF1<0,SKIPIF1<0平面SKIPIF1<0,所以SKIPIF1<0平面SKIPIF1<0,故A正確;對(duì)于B,由SKIPIF1<0,則SKIPIF1<0為正方形,則SKIPIF1<0在正方體中SKIPIF1<0,且SKIPIF1<0,所以SKIPIF1<0平面SKIPIF1<0,又SKIPIF1<0平面SKIPIF1<0,則平面SKIPIF1<0SKIPIF1<0平面SKIPIF1<0假設(shè)平面SKIPIF1<0平面SKIPIF1<0成立,則平面SKIPIF1<0SKIPIF1<0平面SKIPIF1<0,與平面SKIPIF1<0與平面SKIPIF1<0相交矛盾,即假設(shè)不成立,所以平面SKIPIF1<0平面SKIPIF1<0不成立,故B不正確.對(duì)于C,三棱錐SKIPIF1<0的體積即為三棱錐SKIPIF1<0的體積SKIPIF1<0,故SKIPIF1<0正確;對(duì)于D,作SKIPIF1<0,垂足為SKIPIF1<0,因?yàn)槠矫鍿KIPIF1<0平面SKIPIF1<0,所以SKIPIF1<0平面SKIPIF1<0,連接SKIPIF1<0,則SKIPIF1<0為SKIPIF1<0與平面SKIPIF1<0所成的角,SKIPIF1<0,SKIPIF1<0,直線SKIPIF1<0與平面SKIPIF1<0所成角的正弦值為SKIPIF1<0,故D錯(cuò)誤.故選:AC.10.某企業(yè)節(jié)能降耗技術(shù)改造后,在生產(chǎn)某產(chǎn)品過(guò)程中記錄的產(chǎn)量SKIPIF1<0(噸)與相應(yīng)的生產(chǎn)能耗SKIPIF1<0(噸)的幾組對(duì)應(yīng)數(shù)據(jù)如表,現(xiàn)發(fā)現(xiàn)表中有個(gè)數(shù)據(jù)看不清,已知回歸直線方程為SKIPIF1<0,下列說(shuō)法正確的是()SKIPIF1<023456SKIPIF1<01925★3844A.看不清的數(shù)據(jù)★的值為34B.回歸直線SKIPIF1<0必經(jīng)過(guò)樣本點(diǎn)(4,★)C.回歸系數(shù)6.3的含義是產(chǎn)量每增加1噸,相應(yīng)的生產(chǎn)能耗實(shí)際增加6.3噸D.據(jù)此模型預(yù)測(cè)產(chǎn)量為7噸時(shí),相應(yīng)的生產(chǎn)能耗為50.9噸【答案】AD【詳解】A.因?yàn)镾KIPIF1<0,所以SKIPIF1<0,所以★SKIPIF1<0,故正確;B.因?yàn)镾KIPIF1<0,所以SKIPIF1<0必經(jīng)過(guò)SKIPIF1<0,不經(jīng)過(guò)SKIPIF1<0,故錯(cuò)誤;C.回歸系數(shù)6.3的含義是產(chǎn)量每增加1噸,相應(yīng)的生產(chǎn)能耗大約增加6.3噸,故錯(cuò)誤;D.當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,故正確,故選:AD.11.已知SKIPIF1<0,SKIPIF1<0,且SKIPIF1<0,則下列結(jié)論正確的是()A.SKIPIF1<0的最小值為2 B.當(dāng)SKIPIF1<0均不為1時(shí),SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】ABD【詳解】因?yàn)镾KIPIF1<0,當(dāng)且僅當(dāng)SKIPIF1<0時(shí),等號(hào)成立,故A正確;因?yàn)镾KIPIF1<0,所以SKIPIF1<0,當(dāng)SKIPIF1<0,SKIPIF1<0均不為1時(shí),SKIPIF1<0,故B正確;因?yàn)镾KIPIF1<0,所以SKIPIF1<0,由A知,SKIPIF1<0的最小值為2,所以SKIPIF1<0,故C不正確;SKIPIF1<0,當(dāng)且僅當(dāng)SKIPIF1<0時(shí)等號(hào)成立,故D正確;故選:ABD12.已知橢圓SKIPIF1<0:SKIPIF1<0(SKIPIF1<0)的左、右焦點(diǎn)分別為SKIPIF1<0,SKIPIF1<0,離心率為SKIPIF1<0,橢圓SKIPIF1<0的上頂點(diǎn)為SKIPIF1<0,且SKIPIF1<0的面積為SKIPIF1<0.雙曲線SKIPIF1<0和橢圓SKIPIF1<0焦點(diǎn)相同,且雙曲線SKIPIF1<0的離心率為SKIPIF1<0,SKIPIF1<0是橢圓SKIPIF1<0與雙曲線SKIPIF1<0的一個(gè)公共點(diǎn),若SKIPIF1<0,則下列說(shuō)法正確的是()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】AC【詳解】解:設(shè)雙曲線的標(biāo)準(zhǔn)方程為SKIPIF1<0,半焦距為SKIPIF1<0,因?yàn)闄E圓SKIPIF1<0的上頂點(diǎn)為SKIPIF1<0,且SKIPIF1<0的面積為SKIPIF1<0。所以SKIPIF1<0,解得SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,不妨設(shè)點(diǎn)SKIPIF1<0在第一象限,設(shè)SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0,在SKIPIF1<0中,由余弦定理可得SKIPIF1<0,所以SKIPIF1<0,即SKIPIF1<0,兩邊同除以SKIPIF1<0,得SKIPIF1<0,解得SKIPIF1<0,所以SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,故選:AC填空題(本大題共4小題,每小題5分,共20分)13.若命題“SKIPIF1<0”為真命題,則實(shí)數(shù)SKIPIF1<0的取值范圍為_(kāi)_______________________【答案】SKIPIF1<0【詳解】全稱(chēng)命題是真命題,即SKIPIF1<0在R上恒成立,則判別式SKIPIF1<0,解得SKIPIF1<0或SKIPIF1<0,故答案為:SKIPIF1<0.14.已知SKIPIF1<0,則SKIPIF1<0的最小值是_________.【答案】SKIPIF1<0【詳解】由SKIPIF1<0,得SKIPIF1<0,則SKIPIF1<0SKIPIF1<0SKIPIF1<0,當(dāng)且僅當(dāng)SKIPIF1<0時(shí)等號(hào)成立,此時(shí)SKIPIF1<0或SKIPIF1<0;則SKIPIF1<0的最小值是SKIPIF1<0.故答案為:SKIPIF1<0.15.已知函數(shù)f(x)=cos(ωx+φ)(ω>0,|φ|≤SKIPIF1<0),x=-SKIPIF1<0為f(x)的零點(diǎn),x=SKIPIF1<0為y=f(x)圖象的對(duì)稱(chēng)軸,且f(x)在(SKIPIF1<0,SKIPIF1<0)上單調(diào),則ω的最大值為_(kāi)_____.【答案】SKIPIF1<0【詳解】由題意可得SKIPIF1<0,即SKIPIF1<0,解得SKIPIF1<0,又因?yàn)镾KIPIF1<0在SKIPIF1<0上單調(diào),所以SKIPIF1<0,即SKIPIF1<0,因?yàn)橐骃KIPIF1<0的最大值,令SKIPIF1<0,因?yàn)镾KIPIF1<0是SKIPIF1<0的對(duì)稱(chēng)軸,所以SKIPIF1<0,又SKIPIF1<0,解得SKIPIF1<0,所以此時(shí)SKIPIF1<0,SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,即SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,在SKIPIF1<0上單調(diào)遞增,故SKIPIF1<0在SKIPIF1<0不單調(diào),同理,令SKIPIF1<0,SKIPIF1<0,SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,因?yàn)镾KIPIF1<0,所以SKIPIF1<0在SKIPIF1<0單調(diào)遞減,滿足題意,所以SKIPIF1<0的最大值為5.16.有五個(gè)球編號(hào)分別為SKIPIF1<0號(hào),有五個(gè)盒子編號(hào)分別也為SKIPIF1<0號(hào),現(xiàn)將這五個(gè)球放入這五個(gè)盒子中,每個(gè)盒子放一個(gè)球,則恰有四個(gè)盒子的編號(hào)與球的編號(hào)不同的放法種數(shù)為_(kāi)____(用數(shù)字作答),記SKIPIF1<0為盒子與球的編號(hào)相同的個(gè)數(shù),則隨機(jī)變量SKIPIF1<0的數(shù)學(xué)期望SKIPIF1<0____.【答案】SKIPIF1<01【詳解】恰有四個(gè)盒子的編號(hào)與球的編號(hào)不同,就是恰由1個(gè)編號(hào)相同,先選出1個(gè)小球,放到對(duì)應(yīng)序號(hào)的盒子里,有SKIPIF1<0種情況,不妨設(shè)5號(hào)球放在5號(hào)盒子里,其余四個(gè)球的放法為SKIPIF1<0,1,4,SKIPIF1<0,SKIPIF1<0,3,4,SKIPIF1<0,SKIPIF1<0,4,1,SKIPIF1<0,SKIPIF1<0,1,4,SKIPIF1<0,SKIPIF1<0,4,1,SKIPIF1<0,SKIPIF1<0,4,2,SKIPIF1<0,SKIPIF1<0,1,2,SKIPIF1<0,SKIPIF1<0,3,1,SKIPIF1<0,SKIPIF1<0,3,2,SKIPIF1<0共9種,故恰好有一個(gè)球的編號(hào)與盒子的編號(hào)相同的投放方法總數(shù)為SKIPIF1<0種;若恰由2個(gè)編號(hào)相同,先在五個(gè)球中任選兩個(gè)球投放到與球編號(hào)相同的盒子內(nèi)有SKIPIF1<0種,剩下的三個(gè)球,不妨設(shè)編號(hào)為3,4,5,投放3號(hào)球的方法數(shù)為SKIPIF1<0,則投放4,5號(hào)球的方法只有一種,根據(jù)分步計(jì)數(shù)原理共有SKIPIF1<0種;若恰由3個(gè)編號(hào)相同,先在五個(gè)盒子中確定3個(gè),使其編號(hào)與球的編號(hào)相同,有SKIPIF1<0種情況,剩下有2個(gè)盒子放2個(gè)球;其編號(hào)與球的編號(hào)不同,只有1種情況;由分步計(jì)數(shù)原理可知共有SKIPIF1<0種,若恰由5個(gè)編號(hào)相同(不可能恰有4個(gè)相同),有1種方法;因?yàn)檫@五個(gè)球放入這五個(gè)盒子中,每個(gè)盒子放一個(gè)球共有SKIPIF1<0種方法,所以0個(gè)編號(hào)相同的方法為SKIPIF1<0種,綜上,SKIPIF1<0可取的值為0,1,2,3,5,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,故答案為:45,1.四、解答題(本大題共6小題,共70分)17.在①SKIPIF1<0,②SKIPIF1<0,③SKIPIF1<0這三個(gè)條件中任選一個(gè),補(bǔ)充在下面問(wèn)題中,并進(jìn)行求解.問(wèn)題:在SKIPIF1<0中,內(nèi)角SKIPIF1<0,SKIPIF1<0,SKIPIF1<0所對(duì)的邊分別為SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,點(diǎn)SKIPIF1<0,SKIPIF1<0是SKIPIF1<0邊上的兩個(gè)三等分點(diǎn),SKIPIF1<0,______;(1)求SKIPIF1<0的長(zhǎng).(2)求SKIPIF1<0外接圓半徑.【答案】(1)答案見(jiàn)解析;(2)SKIPIF1<0.【詳解】(1)解:若選擇條件①因?yàn)镾KIPIF1<0,所以SKIPIF1<0,設(shè)SKIPIF1<0,所以SKIPIF1<0;又SKIPIF1<0,SKIPIF1<0,所以在SKIPIF1<0中,SKIPIF1<0,即SKIPIF1<0,即:SKIPIF1<0,所以SKIPIF1<0或-4(舍去).在SKIPIF1<0中,SKIPIF1<0,所以SKIPIF1<0,若選擇條件②因?yàn)辄c(diǎn)SKIPIF1<0,SKIPIF1<0是SKIPIF1<0邊上的三等分點(diǎn),且SKIPIF1<0,所以SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0.在SKIPIF1<0中,SKIPIF1<0,所以SKIPIF1<0,若選擇條件③設(shè)SKIPIF1<0,則SKIPIF1<0,在SKIPIF1<0中,SKIPIF1<0,同樣在SKIPIF1<0中,SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,在SKIPIF1<0中,SKIPIF1<0,所以SKIPIF1<0,(2)SKIPIF1<0,所以SKIPIF1<0,由正弦定理可得:SKIPIF1<0,所以外接圓半徑為SKIPIF1<0.18.現(xiàn)某廠商抓住商機(jī)在去年用450萬(wàn)元購(gòu)進(jìn)一批VR設(shè)備,經(jīng)調(diào)試后今年投入使用,計(jì)劃第一年維修、保養(yǎng)費(fèi)用22萬(wàn)元,從第二年開(kāi)始,每年所需維修、保養(yǎng)費(fèi)用比上一年增加4萬(wàn)元,該設(shè)備使用后,每年的總收入為180萬(wàn)元,設(shè)使用SKIPIF1<0年后設(shè)備的盈利額為SKIPIF1<0萬(wàn)元.(1)寫(xiě)出SKIPIF1<0與SKIPIF1<0之間的函數(shù)關(guān)系式;(2)使用若干年后,當(dāng)年平均盈利額達(dá)到最大值時(shí),求該廠商的盈利額.【答案】(1)SKIPIF1<0;(2)1500萬(wàn)元.【詳解】(1)依題可得SKIPIF1<0即SKIPIF1<0關(guān)于SKIPIF1<0的函數(shù)關(guān)系式為SKIPIF1<0,SKIPIF1<0.(2)由(1)知,當(dāng)年的平均盈利額為:SKIPIF1<0,當(dāng)且僅當(dāng)SKIPIF1<0時(shí),即SKIPIF1<0時(shí)等號(hào)成立.所以使用15年后平均盈利額達(dá)到最大值,該廠商盈利額為1500萬(wàn)元.19.某中學(xué)的環(huán)保社團(tuán)參照國(guó)家環(huán)境標(biāo)準(zhǔn)制定了該校所在區(qū)域的空氣質(zhì)量指數(shù)與空氣質(zhì)量等級(jí)對(duì)應(yīng)關(guān)系,如下表(假設(shè)該區(qū)域空氣質(zhì)量指數(shù)不會(huì)超過(guò)300):空氣質(zhì)量指數(shù)SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0空氣質(zhì)量等級(jí)1級(jí)優(yōu)2級(jí)良3級(jí)輕度污染4級(jí)中度污染5級(jí)重度污染6級(jí)嚴(yán)重污染該社團(tuán)將該校區(qū)在2019年100天的空氣質(zhì)量指數(shù)監(jiān)測(cè)數(shù)據(jù)作為樣本,繪制的頻率分布直方圖如圖所示,把該直方圖所得頻率估計(jì)為概率.(1)請(qǐng)估算2019年(以365天計(jì)算)全年空氣質(zhì)量?jī)?yōu)?良的天數(shù)(未滿一天按一天計(jì)算);(2)該校2019年某三天舉行了一場(chǎng)運(yùn)動(dòng)會(huì),若這三天中某天出現(xiàn)5級(jí)重度污染,需要凈化空氣費(fèi)用10000元,出現(xiàn)6級(jí)嚴(yán)重污染,需要凈化空氣費(fèi)用20000元,記這三天凈化空氣總費(fèi)用為SKIPIF1<0元,求SKIPIF1<0的分布列.【答案】(1)SKIPIF1<0;(2)分布列答案見(jiàn)解析.【詳解】(1)由頻率分布直方圖可估算2019年(以365天計(jì)算)全年空氣質(zhì)量?jī)?yōu)?良的天數(shù)為SKIPIF1<0.(2)由題意知,SKIPIF1<0的所有可能取值為0,10000,20000,30000,40000,50000,60000,由頻率分布直方圖知空氣質(zhì)量指數(shù)為SKIPIF1<0的概率為SKIPIF1<0,空氣質(zhì)量指數(shù)為SKIPIF1<0的概率為SKIPIF1<0,空氣質(zhì)量指數(shù)為SKIPIF1<0的概率為SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.所以SKIPIF1<0的分布列為SKIPIF1<00100002000030000400005000060000SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<020.如圖,SKIPIF1<0平面SKIPIF1<0,SKIPIF1<0,點(diǎn)M為BQ的中點(diǎn).(1)求二面角SKIPIF1<0的正弦值;(2)若SKIPIF1<0為線段SKIPIF1<0上的點(diǎn),且直線SKIPIF1<0與平面SKIPIF1<0所成的角為SKIPIF1<0,求線段SKIPIF1<0的長(zhǎng).【答案】(1)SKIPIF1<0;(2)SKIPIF1<0【詳解】解:(1)SKIPIF1<0平面SKIPIF1<0,SKIPIF1<0,SKIPIF1<0以SKIPIF1<0為坐標(biāo)原點(diǎn),SKIPIF1<0,SKIPIF1<0,SKIPIF1<0的方向?yàn)镾KIPIF1<0軸,SKIPIF1<0軸,SKIPIF1<0軸建立如圖所示的空間直角坐標(biāo)系,由題意得:SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,設(shè)平面SKIPIF1<0和平面SKIPIF1<0的法向量分別為SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0,即SKIPIF1<0,令SKIPIF1<0,即SKIPIF1<0,SKIPIF1<0,即SKIPIF1<0,令SKIPIF1<0,即SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,二面角SKIPIF1<0的正弦值為SKIPIF1<0;(2)設(shè)SKIPIF1<0,SKIPIF1<0,即SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0,由(1)知:平面SKIPIF1<0的法向量為SKIPIF1<0,由題意知:SKIPIF1<0,即SKIPIF1<0,整理得:SKIPIF1<0,解得:SKIPIF1<0,或SKIPIF1<0,又SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,即線段SKIPIF1<0的長(zhǎng)為SKIPIF1<0.21.已知函數(shù)SKIPIF1<0.(1)求函數(shù)SKIPIF1<0的單調(diào)區(qū)間;(2)當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,記函數(shù)SKIPIF1<0在SKIPIF1<0上的最大值為SKIPIF1<0,證明:SKIPIF1<0.【答案】(1)答案見(jiàn)解析;(2)證明見(jiàn)解析.【詳解】(1)由函數(shù)SKIPIF1<0的定義域是SKIPIF1<0,則SKIPIF1<0.當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,此時(shí)在區(qū)間SKIPIF1<0上,SKIPIF1<0;在區(qū)間SKIPIF1<0上,SKIPIF1<0,故函數(shù)SKIPIF1<0的單調(diào)遞減區(qū)間為SKIPIF1<0,單調(diào)遞增區(qū)間為SKIPIF1<0.當(dāng)SKIPIF1<0且SKIPIF1<0時(shí),即SKIPIF1<0時(shí),SKIPIF1<0對(duì)任意SKIPIF1<0恒成立,即SKIPIF1<0對(duì)任意SKIPIF1<0恒成立,且不恒為0.故函數(shù)SKIPIF1<0的單調(diào)遞減區(qū)間為SKIPIF1<0;當(dāng)SKIPIF1<0且SKIPIF1<0時(shí),即SKIPIF1<0時(shí),方程SKIPIF1<0的兩根依次為SKIPIF1<0,SKIPIF1<0,此時(shí)在區(qū)間SKIPIF1<0,SKIPIF1<0上,SKIPIF1<0;在區(qū)間SKIPIF1<0上,SKIPIF1<0,故函數(shù)SKIPIF1<0的單調(diào)遞減區(qū)間為SKIPIF1<0,SKIPIF1<0,單調(diào)遞增區(qū)間為SKIPIF1<0;當(dāng)SKIPIF1<0時(shí),方程SKIPIF1<0的兩根依次為SKIPIF1<0,SKIPIF1<0,此時(shí)在區(qū)間SKIPIF1<0上,SKIPIF1<0;在區(qū)間SKIPIF1<0上,SKIPIF1<0,故函數(shù)SKIPIF1<0的單調(diào)遞減區(qū)間為SKIPIF1<0,單調(diào)遞增區(qū)間為SKIPIF1<0;(2)證明:當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,則SKIPIF1<0.當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,令SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0在SKIPIF1<0上單調(diào)遞增.因?yàn)镾KIPIF1<0,SKIPIF1<0,所以存在SKIPIF1<0使得SKIPIF1<0,即SKIPIF1<0,即SKIPIF1<0.故當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,此時(shí)SKIPIF1<0;當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,此時(shí)SKIPIF1<0.即SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,在SKIPIF1<0上單調(diào)遞減,則SKIPIF1<0.令SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,則SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0.故SKIPIF1<0.22.在直角坐標(biāo)系SKIPIF1<0中,橢圓SKIPIF1<0:SKIPIF1<0的離心率為SKIPIF1<0,左、右焦點(diǎn)分別是SKIPIF1<0,SKIPIF1<0,SKIPIF1<0為橢圓SKIPIF1<0
溫馨提示
- 1. 本站所有資源如無(wú)特殊說(shuō)明,都需要本地電腦安裝OFFICE2007和PDF閱讀器。圖紙軟件為CAD,CAXA,PROE,UG,SolidWorks等.壓縮文件請(qǐng)下載最新的WinRAR軟件解壓。
- 2. 本站的文檔不包含任何第三方提供的附件圖紙等,如果需要附件,請(qǐng)聯(lián)系上傳者。文件的所有權(quán)益歸上傳用戶(hù)所有。
- 3. 本站RAR壓縮包中若帶圖紙,網(wǎng)頁(yè)內(nèi)容里面會(huì)有圖紙預(yù)覽,若沒(méi)有圖紙預(yù)覽就沒(méi)有圖紙。
- 4. 未經(jīng)權(quán)益所有人同意不得將文件中的內(nèi)容挪作商業(yè)或盈利用途。
- 5. 人人文庫(kù)網(wǎng)僅提供信息存儲(chǔ)空間,僅對(duì)用戶(hù)上傳內(nèi)容的表現(xiàn)方式做保護(hù)處理,對(duì)用戶(hù)上傳分享的文檔內(nèi)容本身不做任何修改或編輯,并不能對(duì)任何下載內(nèi)容負(fù)責(zé)。
- 6. 下載文件中如有侵權(quán)或不適當(dāng)內(nèi)容,請(qǐng)與我們聯(lián)系,我們立即糾正。
- 7. 本站不保證下載資源的準(zhǔn)確性、安全性和完整性, 同時(shí)也不承擔(dān)用戶(hù)因使用這些下載資源對(duì)自己和他人造成任何形式的傷害或損失。
最新文檔
- 2024-2030年辦公桌綜合試驗(yàn)機(jī)公司技術(shù)改造及擴(kuò)產(chǎn)項(xiàng)目可行性研究報(bào)告
- 2024-2030年其他未列明公司技術(shù)改造及擴(kuò)產(chǎn)項(xiàng)目可行性研究報(bào)告
- 托育美食烘培課程設(shè)計(jì)
- 2024-2030年全球及中國(guó)玻璃纖維管道覆蓋層行業(yè)發(fā)展動(dòng)態(tài)及投資規(guī)劃分析報(bào)告
- 2024-2030年全球及中國(guó)活性膠原蛋白保健品行業(yè)銷(xiāo)售規(guī)模及營(yíng)銷(xiāo)策略研究報(bào)告
- 2024-2030年全球及中國(guó)標(biāo)準(zhǔn)海運(yùn)干貨集裝箱行業(yè)現(xiàn)狀規(guī)模及發(fā)展前景預(yù)測(cè)報(bào)告
- 2024-2030年全球及中國(guó)投幣機(jī)行業(yè)盈利模式及需求前景預(yù)測(cè)報(bào)告
- 2024-2030年全球及中國(guó)家電用薄膜電容器行業(yè)盈利動(dòng)態(tài)及投資效益預(yù)測(cè)報(bào)告
- 2024-2030年全球與中國(guó)蒸汽壓力測(cè)試儀市場(chǎng)銷(xiāo)售策略及競(jìng)爭(zhēng)趨勢(shì)預(yù)測(cè)報(bào)告
- 2024-2030年全球SCADA行業(yè)發(fā)展動(dòng)態(tài)及投資前景預(yù)測(cè)報(bào)告
- PS平面設(shè)計(jì)練習(xí)題庫(kù)(附參考答案)
- 混合云架構(gòu)整體設(shè)計(jì)及應(yīng)用場(chǎng)景介紹
- 《盤(pán)點(diǎn)程序說(shuō)明會(huì)》課件
- 期末素養(yǎng)綜合測(cè)評(píng)卷(二)2024-2025學(xué)年魯教版(五四制)六年級(jí)數(shù)學(xué)上冊(cè)(解析版)
- 小王子-英文原版
- 考核19(西餐)試題
- 2024安全生產(chǎn)法解讀
- 吉林省長(zhǎng)春市(2024年-2025年小學(xué)五年級(jí)語(yǔ)文)人教版期末考試(上學(xué)期)試卷及答案
- 環(huán)保創(chuàng)業(yè)孵化器服務(wù)行業(yè)營(yíng)銷(xiāo)策略方案
- 研究生年終總結(jié)和展望
- 浙江省杭州市2023-2024學(xué)年高二上學(xué)期1月期末地理試題 含解析
評(píng)論
0/150
提交評(píng)論