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高一上學(xué)期期末數(shù)學(xué)試題說明:本試卷分第Ⅰ卷(選擇題)和第Ⅱ卷(非選擇題)兩部分,共150分.考試時(shí)間120分鐘,本次考試不得使用計(jì)算器,請(qǐng)考生將所有題目都做在答題卡上.第I卷(選擇題共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.已知全集為SKIPIF1<0,集合SKIPIF1<0,集合SKIPIF1<0,則SKIPIF1<0()A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】C【解析】【分析】解一元二次不等式求得集合SKIPIF1<0,由此求得SKIPIF1<0【詳解】SKIPIF1<0,解得SKIPIF1<0或SKIPIF1<0,所以SKIPIF1<0或SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0SKIPIF1<0.故選:C2.函數(shù)SKIPIF1<0的零點(diǎn)所在的區(qū)間為()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【解析】【分析】根據(jù)函數(shù)的單調(diào)性以及零點(diǎn)存在性定理求得正確答案.【詳解】SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,SKIPIF1<0,所以SKIPIF1<0的零點(diǎn)在區(qū)間SKIPIF1<0.故選:B3.已知SKIPIF1<0,SKIPIF1<0為非零實(shí)數(shù),則“SKIPIF1<0”是“SKIPIF1<0”的()A.充分不必要條件 B.必要不充分條件C.充要條件 D.既不充分也不必要條件【答案】A【解析】【分析】根據(jù)充分、必要條件的知識(shí)求得正確答案.【詳解】當(dāng)SKIPIF1<0時(shí),SKIPIF1<0同號(hào)且非零,則SKIPIF1<0,所以SKIPIF1<0.當(dāng)SKIPIF1<0時(shí),如SKIPIF1<0,則SKIPIF1<0,無法得到SKIPIF1<0.所以“SKIPIF1<0”是“SKIPIF1<0”的充分不必要條件.故選:A4.函數(shù)SKIPIF1<0的定義域是()A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】【分析】利用整體代入法求得正確答案.【詳解】由SKIPIF1<0,解得SKIPIF1<0,所以函數(shù)的定義域是SKIPIF1<0.故選:D5.已知定義在SKIPIF1<0上的奇函數(shù)SKIPIF1<0滿足SKIPIF1<0,則SKIPIF1<0()A.-1 B.0 C.1 D.2【答案】B【解析】【分析】根據(jù)函數(shù)奇偶性、周期性求得正確答案.【詳解】SKIPIF1<0是定義在SKIPIF1<0上的奇函數(shù),所以SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0是周期為SKIPIF1<0的周期函數(shù),所以SKIPIF1<0.故選:B6.已知SKIPIF1<0,則SKIPIF1<0()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【解析】【分析】利用誘導(dǎo)公式、同角三角函數(shù)的基本關(guān)系式求得正確答案.【詳解】SKIPIF1<0.故選:B7.已知SKIPIF1<0,SKIPIF1<0,則()A.SKIPIF1<0的最大值為SKIPIF1<0且SKIPIF1<0的最大值為SKIPIF1<0B.SKIPIF1<0的最大值為SKIPIF1<0且SKIPIF1<0的最小值為0C.SKIPIF1<0的最小值為SKIPIF1<0且SKIPIF1<0的最大值為SKIPIF1<0D.SKIPIF1<0的最小值為SKIPIF1<0且SKIPIF1<0的最小值為0【答案】C【解析】【分析】利用SKIPIF1<0可求出SKIPIF1<0的最小值,利用SKIPIF1<0可求出SKIPIF1<0的最大值.【詳解】利用SKIPIF1<0,則SKIPIF1<0,整理得SKIPIF1<0,當(dāng)且僅當(dāng)SKIPIF1<0,即SKIPIF1<0時(shí)取得等號(hào),即SKIPIF1<0的最小值為SKIPIF1<0;利用SKIPIF1<0,SKIPIF1<0,即SKIPIF1<0,整理得SKIPIF1<0,即SKIPIF1<0,當(dāng)且僅當(dāng)SKIPIF1<0時(shí)取得等號(hào),故SKIPIF1<0的最大值為SKIPIF1<0.故選:C8.若關(guān)于SKIPIF1<0的方程SKIPIF1<0恰有三個(gè)不同的實(shí)數(shù)解SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,且SKIPIF1<0,其中SKIPIF1<0,則SKIPIF1<0的值為()A.-6 B.-4 C.-3 D.-2【答案】A【解析】【分析】利用換元法化簡題目所給方程,結(jié)合二次函數(shù)零點(diǎn)分布、對(duì)勾函數(shù)的性質(zhì)等知識(shí)求得正確答案.【詳解】依題意可知SKIPIF1<0,由SKIPIF1<0整理得SKIPIF1<0①,即關(guān)于SKIPIF1<0的方程恰有三個(gè)不同的實(shí)數(shù)解SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,且SKIPIF1<0,令SKIPIF1<0,則SKIPIF1<0或SKIPIF1<0,則①轉(zhuǎn)化為SKIPIF1<0,即SKIPIF1<0,根據(jù)對(duì)勾函數(shù)的性質(zhì)可知SKIPIF1<0是方程SKIPIF1<0的一個(gè)根,所以SKIPIF1<0,所以SKIPIF1<0,解得SKIPIF1<0或SKIPIF1<0,所以SKIPIF1<0是方程SKIPIF1<0的根,即SKIPIF1<0的根,所以SKIPIF1<0,所以SKIPIF1<0.故選:A【點(diǎn)睛】對(duì)于復(fù)雜方程的跟有關(guān)的問題求解,可根據(jù)題目所給已知方程進(jìn)行轉(zhuǎn)化,轉(zhuǎn)化的方向是熟悉的函數(shù)類型,即將不熟悉的問題轉(zhuǎn)化為熟悉的問題來進(jìn)行求解.對(duì)鉤函數(shù)是函數(shù)題目中常見的函數(shù),對(duì)其性質(zhì)要注意總結(jié).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.下列說法正確的有()A.若SKIPIF1<0是銳角,則SKIPIF1<0是第一象限角B.SKIPIF1<0C.若SKIPIF1<0,則SKIPIF1<0為第一或第二象限角D.若SKIPIF1<0為第二象限角,則SKIPIF1<0為第一或第三象限角【答案】ABD【解析】【分析】根據(jù)象限角、弧度制、三角函數(shù)值等知識(shí)確定正確答案.【詳解】A選項(xiàng),SKIPIF1<0是銳角,即SKIPIF1<0,所以SKIPIF1<0是第一象限角,A選項(xiàng)正確.B選項(xiàng),根據(jù)弧度制的定義可知SKIPIF1<0,B選項(xiàng)正確.C選項(xiàng),當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,但SKIPIF1<0不是象限角,C選項(xiàng)錯(cuò)誤.D選項(xiàng),SKIPIF1<0為第二象限角,即SKIPIF1<0,所以SKIPIF1<0為第一或第三象限角,D選項(xiàng)正確.故選:ABD10.關(guān)于函數(shù)SKIPIF1<0,下列說法正確的是()A.函數(shù)SKIPIF1<0定義域?yàn)镾KIPIF1<0 B.函數(shù)SKIPIF1<0是偶函數(shù)C.函數(shù)SKIPIF1<0是周期函數(shù) D.函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào)遞減【答案】BCD【解析】【分析】根據(jù)函數(shù)的定義域、奇偶性、周期性、單調(diào)性對(duì)選項(xiàng)進(jìn)行分析,從而確定正確答案.【詳解】由于SKIPIF1<0,所以SKIPIF1<0的定義域不是SKIPIF1<0,A選項(xiàng)錯(cuò)誤.由SKIPIF1<0得SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0的定義域是SKIPIF1<0,SKIPIF1<0的定義域關(guān)于原點(diǎn)對(duì)稱,SKIPIF1<0,所以SKIPIF1<0是偶函數(shù),B選項(xiàng)正確.SKIPIF1<0,所以SKIPIF1<0是周期函數(shù),C選項(xiàng)正確.當(dāng)SKIPIF1<0時(shí),SKIPIF1<0恒成立,SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,所以SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào)遞減,D選項(xiàng)正確.故選:BCD11.已知SKIPIF1<0且SKIPIF1<0,函數(shù)SKIPIF1<0的圖象可能是()A. B.C. D.【答案】AD【解析】【分析】根據(jù)函數(shù)的單調(diào)性、特殊點(diǎn)的函數(shù)值確定正確答案.【詳解】依題意SKIPIF1<0且SKIPIF1<0,SKIPIF1<0,B選項(xiàng)錯(cuò)誤SKIPIF1<0
當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,且SKIPIF1<0在SKIPIF1<0上遞增,A選項(xiàng)符合題意.當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,在CD選項(xiàng)中,C選項(xiàng)錯(cuò)誤,則D選項(xiàng)正確.故選:AD12.已知實(shí)數(shù)SKIPIF1<0,SKIPIF1<0滿足SKIPIF1<0,則下列關(guān)系式可能正確的是()A.SKIPIF1<0,使SKIPIF1<0B.SKIPIF1<0,使SKIPIF1<0C.SKIPIF1<0,有SKIPIF1<0D.SKIPIF1<0,有SKIPIF1<0【答案】ABCD【解析】【分析】由原方程可得SKIPIF1<0,構(gòu)造函數(shù),由函數(shù)的單調(diào)性得出值域,根據(jù)函數(shù)的值域判斷A;令SKIPIF1<0,代入原方程轉(zhuǎn)化為判斷SKIPIF1<0是否有解即可判斷B,條件變形放縮后構(gòu)造函數(shù),利用函數(shù)的單調(diào)性得出SKIPIF1<0大小,判斷CD,【詳解】對(duì)于A,由SKIPIF1<0得SKIPIF1<0,令SKIPIF1<0,則SKIPIF1<0分別在SKIPIF1<0和SKIPIF1<0上單調(diào)遞增,令SKIPIF1<0,則SKIPIF1<0分別在SKIPIF1<0和SKIPIF1<0上單調(diào)遞增,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0的值域?yàn)镾KIPIF1<0當(dāng)SKIPIF1<0時(shí),SKIPIF1<0的值域?yàn)镾KIPIF1<0,所以存在SKIPIF1<0,使得SKIPIF1<0;同理可得,存在SKIPIF1<0,使得SKIPIF1<0,因此SKIPIF1<0,使SKIPIF1<0,A正確;對(duì)于B,令SKIPIF1<0,則方程SKIPIF1<0可化為SKIPIF1<0,由換底公式可得SKIPIF1<0,顯然關(guān)于SKIPIF1<0的方程在SKIPIF1<0上有解,所以SKIPIF1<0,使SKIPIF1<0,B正確;對(duì)于C,當(dāng)SKIPIF1<0時(shí),因?yàn)镾KIPIF1<0,所以SKIPIF1<0,又SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,所以SKIPIF1<0.又SKIPIF1<0,令SKIPIF1<0,則SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,因SKIPIF1<0,所以SKIPIF1<0,從而可得SKIPIF1<0,所以SKIPIF1<0.綜上所述可得SKIPIF1<0,C正確;對(duì)于D,當(dāng)SKIPIF1<0時(shí),因?yàn)镾KIPIF1<0,所以SKIPIF1<0,又SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,所以SKIPIF1<0.又SKIPIF1<0,令SKIPIF1<0,則SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,從而SKIPIF1<0,所以SKIPIF1<0.綜上所述可得SKIPIF1<0,所以D正確.故選:ABCD【點(diǎn)睛】關(guān)鍵點(diǎn)點(diǎn)睛:對(duì)于CD選項(xiàng)的關(guān)鍵在于變形、放縮,恰當(dāng)放縮后不等式兩邊可看做同一函數(shù)的兩個(gè)函數(shù)值,據(jù)此構(gòu)造函數(shù),利用函數(shù)的單調(diào)性,建立自變量的大小關(guān)系,化繁為簡,得出SKIPIF1<0的關(guān)系,再利用對(duì)數(shù)性質(zhì)放縮即可判斷結(jié)論,本題難度較大,技巧性較強(qiáng),屬于難題.第Ⅱ卷(非選擇題共90分)三、填空題:本題共4小題,每小題5分,共20分.13.化簡求值:SKIPIF1<0______.【答案】SKIPIF1<0##0.75【解析】【分析】根據(jù)對(duì)數(shù)的運(yùn)算法則、性質(zhì),換底公式求解.【詳解】SKIPIF1<0SKIPIF1<0.故答案為:SKIPIF1<014.已知函數(shù)SKIPIF1<0的圖象是一條連續(xù)不斷的曲線,當(dāng)SKIPIF1<0時(shí),值域?yàn)镾KIPIF1<0,且在SKIPIF1<0上有兩個(gè)零點(diǎn),請(qǐng)寫出一個(gè)滿足上述條件的SKIPIF1<0______.【答案】SKIPIF1<0(答案不唯一,如SKIPIF1<0亦可)【解析】【分析】根據(jù)函數(shù)的自變量、值域、零點(diǎn)在學(xué)過函數(shù)中找到滿足條件的函數(shù)即可.【詳解】根據(jù)函數(shù)自變量SKIPIF1<0時(shí),函數(shù)值域?yàn)镾KIPIF1<0,可考慮二次函數(shù)SKIPIF1<0,根據(jù)二次函數(shù)性質(zhì)可知SKIPIF1<0時(shí),SKIPIF1<0,SKIPIF1<0,令SKIPIF1<0,解得SKIPIF1<0,即在SKIPIF1<0上有兩個(gè)零點(diǎn).故答案為:SKIPIF1<0(答案不唯一,如SKIPIF1<0亦可)15.炎炎夏日,古代人們乘涼時(shí)用的紙疊扇可看作是從一個(gè)圓面中剪下的扇形加工制作而成.如圖,扇形紙疊扇完全展開后,得到的扇形ABC面積為SKIPIF1<0,則當(dāng)該紙疊扇的周長最小時(shí),SKIPIF1<0的長度為______cm.【答案】SKIPIF1<0【解析】【分析】設(shè)扇形ABC半徑為SKIPIF1<0,弧長為SKIPIF1<0,根據(jù)扇形ABC的面積得到SKIPIF1<0,紙疊扇的周長SKIPIF1<0,利用基本不等式求解即可.【詳解】設(shè)扇形ABC的半徑為SKIPIF1<0,弧長為SKIPIF1<0,則扇形面積SKIPIF1<0.由題意得SKIPIF1<0,所以SKIPIF1<0.所以紙疊扇的周長SKIPIF1<0,當(dāng)且僅當(dāng)SKIPIF1<0即SKIPIF1<0,SKIPIF1<0時(shí),等號(hào)成立,所以此時(shí)SKIPIF1<0的長度為SKIPIF1<0.故答案為:SKIPIF1<016.已知函數(shù)SKIPIF1<0,若函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0內(nèi)沒有零點(diǎn),則實(shí)數(shù)SKIPIF1<0的最大值是______.【答案】SKIPIF1<0【解析】【分析】化簡函數(shù)解析式,先求出SKIPIF1<0整體的范圍,由在區(qū)間SKIPIF1<0內(nèi)沒有零點(diǎn)得出不等式,解出SKIPIF1<0的范圍,再結(jié)合SKIPIF1<0的取值,即可求解.【詳解】SKIPIF1<0,由SKIPIF1<0可得SKIPIF1<0,又SKIPIF1<0在區(qū)間SKIPIF1<0內(nèi)沒有零點(diǎn),則SKIPIF1<0,解得SKIPIF1<0,又SKIPIF1<0,解得SKIPIF1<0,又SKIPIF1<0,所以SKIPIF1<0或SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0;當(dāng)SKIPIF1<0時(shí),SKIPIF1<0;綜上:SKIPIF1<0的最大值為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)寫出文字說明、證明過程或演算步驟.17.在①SKIPIF1<0是SKIPIF1<0的充分不必要條件;②SKIPIF1<0;③SKIPIF1<0這三個(gè)條件中任選一個(gè),補(bǔ)充到本題第(2)問的橫線處,求解下列問題.問題:已知集合SKIPIF1<0,集合SKIPIF1<0.(1)當(dāng)SKIPIF1<0時(shí),求SKIPIF1<0;(2)若______,求實(shí)數(shù)SKIPIF1<0的取值范圍.【答案】(1)SKIPIF1<0(2)答案見解析【解析】【分析】(1)解絕對(duì)值不等式求得集合SKIPIF1<0,由此求得SKIPIF1<0.(2)通過選擇的條件列不等式,由此求得SKIPIF1<0的取值范圍.【小問1詳解】SKIPIF1<0,所以SKIPIF1<0.當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,所以SKIPIF1<0.【小問2詳解】由(1)得SKIPIF1<0,選①,SKIPIF1<0是SKIPIF1<0的充分不必要條件,則SKIPIF1<0且等號(hào)不同時(shí)成立,解得SKIPIF1<0.選②,SKIPIF1<0,則SKIPIF1<0,解得SKIPIF1<0.選③,SKIPIF1<0,則SKIPIF1<0或SKIPIF1<0,解得SKIPIF1<0或SKIPIF1<0.18.已知函數(shù)SKIPIF1<0,且SKIPIF1<0,SKIPIF1<0.(1)求SKIPIF1<0的值;(2)若SKIPIF1<0,SKIPIF1<0,求SKIPIF1<0.【答案】(1)SKIPIF1<0(2)SKIPIF1<0【解析】【分析】(1)利用平方的方法,結(jié)合同角三角函數(shù)的基本關(guān)系式求得正確答案.(2)利用兩角差的余弦公式、同角三角函數(shù)的基本關(guān)系式求得正確答案.【小問1詳解】由題意SKIPIF1<0,SKIPIF1<0,由于SKIPIF1<0,所以SKIPIF1<0,故由SKIPIF1<0可解得SKIPIF1<0,SKIPIF1<0.所以SKIPIF1<0.【小問2詳解】由(1)可知:SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0因?yàn)镾KIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0.19.已知函數(shù)SKIPIF1<0,SKIPIF1<0.(1)若SKIPIF1<0在SKIPIF1<0上有零點(diǎn),求實(shí)數(shù)SKIPIF1<0的取值范圍;(2)若SKIPIF1<0在區(qū)間SKIPIF1<0上的最小值為-2,求實(shí)數(shù)SKIPIF1<0的值.【答案】(1)SKIPIF1<0(2)SKIPIF1<0或SKIPIF1<0【解析】【分析】(1)根據(jù)二次函數(shù)零點(diǎn)分布的知識(shí)求得SKIPIF1<0的取值范圍.(2)根據(jù)SKIPIF1<0在區(qū)間SKIPIF1<0端點(diǎn)或?qū)ΨQ軸(二次函數(shù)時(shí))處取得最小值進(jìn)行分類討論,由此求得SKIPIF1<0的值.【小問1詳解】SKIPIF1<0在SKIPIF1<0上有零點(diǎn),所以SKIPIF1<0,所以SKIPIF1<0.【小問2詳解】由于二次函數(shù)在閉區(qū)間上的最小值只可能在端點(diǎn)或?qū)ΨQ軸處取到,所以只需考慮一下三種情況并檢驗(yàn)即可:①若SKIPIF1<0,∴SKIPIF1<0.SKIPIF1<0的圖象開口向上,對(duì)稱軸SKIPIF1<0,而SKIPIF1<0,不成立,舍.②若SKIPIF1<0,∴SKIPIF1<0.此時(shí)SKIPIF1<0的圖象開口向上,對(duì)稱軸SKIPIF1<0,成立.③若SKIPIF1<0,∴SKIPIF1<0或SKIPIF1<0.此時(shí)SKIPIF1<0的圖象開口向上,對(duì)稱軸SKIPIF1<0,而此時(shí)SKIPIF1<0,成立.綜上可知,SKIPIF1<0或SKIPIF1<0.20.已知函數(shù)SKIPIF1<0的圖象如圖所示.(1)求函數(shù)SKIPIF1<0的對(duì)稱中心;(2)先將函數(shù)SKIPIF1<0圖象上所有點(diǎn)的縱坐標(biāo)伸長到原來的3倍(橫坐標(biāo)不變),然后將得到的函數(shù)圖象上所有點(diǎn)的橫坐標(biāo)伸長到原來的2倍(縱坐標(biāo)不變),最后將所得圖象向左平移SKIPIF1<0個(gè)單位后得到函數(shù)SKIPIF1<0的圖象.若SKIPIF1<0對(duì)任意的SKIPIF1<0恒成立,求實(shí)數(shù)SKIPIF1<0的取值范圍.【答案】(1)SKIPIF1<0,SKIPIF1<0(2)SKIPIF1<0【解析】【分析】(1)根據(jù)函數(shù)圖象求得SKIPIF1<0的解析式,然后利用整體代入法求得SKIPIF1<0的對(duì)稱中心.(2)利用三角函數(shù)圖象變換的知識(shí)求得SKIPIF1<0的解析式,根據(jù)SKIPIF1<0在區(qū)間SKIPIF1<0上的值域轉(zhuǎn)化不等式SKIPIF1<0,由此求得SKIPIF1<0的取值范圍.【小問1詳解】由圖可知:SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,SKIPIF1<0,又SKIPIF1<0,所以SKIPIF1<0,SKIPIF1<0.所以SKIPIF1<0.令SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0.所以SKIPIF1<0的對(duì)稱中心為SKIPIF1<0,SKIPIF1<0.【小問2詳解】由題SKIPIF1<0.當(dāng)SKIPIF1<0時(shí),SKIPIF1<0.因?yàn)镾KIPIF1<0對(duì)任意的SKIPIF1<0恒成立,則SKIPIF1<0.所以SKIPIF1<0.21.近年來,受全球新冠肺炎疫情影響,不少外貿(mào)企業(yè)遇到展會(huì)停辦、訂單延期等困難,在該形勢(shì)面前,某城市把目光投向了國內(nèi)大市場(chǎng),搭建夜間集市,不僅能拓寬適銷對(duì)路的出口產(chǎn)品內(nèi)銷渠道,助力外貿(mào)企業(yè)開拓國內(nèi)市場(chǎng),更能推進(jìn)內(nèi)外貿(mào)一體化發(fā)展,加速釋放“雙循環(huán)”活力.某夜市的一位文化工藝品售賣者,通過對(duì)每天銷售情況的調(diào)查發(fā)現(xiàn):該工藝品在過去的一個(gè)月內(nèi)(按30天計(jì)),每件的銷售價(jià)格SKIPIF1<0(單位:元)與時(shí)間SKIPIF1<0(單位:天)SKIPIF1<0的函數(shù)關(guān)系滿足SKIPIF1<0(SKIPIF1<0為常數(shù),且SKIPIF1<0),日銷售量SKIPIF1<0(單位:件)與時(shí)間SKIPIF1<0的部分?jǐn)?shù)據(jù)如下表所示:SKIPIF1<015202530SKIPIF1<0105110105100設(shè)該文化工藝品的日銷售收入為SKIPIF1<0(單位:元),且第15天的日銷售收入為1057元.(1)求SKIPIF1<0的值;(2)給出以下四種函數(shù)模型:①SKIPIF1<0;②SKIPIF1<0;③SKIPIF1<0;④SKIPIF1<0.請(qǐng)你根據(jù)上表中的數(shù)據(jù),從中選擇最合適的一種函數(shù)模型來描述日銷售量SKIPIF1<0與時(shí)間SKIPIF1<0的變化關(guān)系,并求出該函數(shù)的解析式;(3)利用問題(2)中的函數(shù)SKIPIF1<0,求SKIPIF1<0的最小值.【答案】(1)SKIPIF1<0(2)選擇函數(shù)模型②SKIPIF1<0,SKIPIF1<0(3)961【解析】【分析】(1)根據(jù)已知條件列方程,由此求得SKIPIF1<0的值.(2)根據(jù)函數(shù)的單調(diào)性選擇模型并根據(jù)已知條件列方程,求得SKIPIF1<0,從而求得SKIPIF1<0的解析式.(3)結(jié)合基本不等式和函數(shù)的單調(diào)性求得正確答案.【小問1詳解】因?yàn)榈?5天的日銷售收入為1057元,所以SKIPIF1<0,解得SKIPIF1<0.【小問2詳解】由表中的數(shù)據(jù)知,當(dāng)時(shí)間SKIPIF1<0變化時(shí),SKIPIF1<0先增后減.而函數(shù)模型①SKIPIF1<0;③SKIPIF1<0;④SKIPIF1<0都是單調(diào)函數(shù),所以選擇函數(shù)模型②SKIPIF1<0.由SKIPIF1<0,解得SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.所以日銷售量SKIPIF1<0與時(shí)間SKIPIF1<0的變化關(guān)系為SKIPIF1<0.【小問3詳解】由(2)知SKIPIF1<0所以SKIPIF1<0即SKIPIF1<0.當(dāng)SKIPIF1<0,SKIPIF1<0時(shí),由基本不等式得,SKIPIF1<0當(dāng)且僅當(dāng)SKIPIF1<0,即SKIPIF1<0時(shí),等號(hào)成立.當(dāng)SKIPIF1<0,SKIPIF1<0時(shí),SKIPIF1<0單調(diào)遞減,所以SKIPIF1<0.綜上所述:當(dāng)SKIPIF1<0時(shí),SKIPIF1<0取得最小值,最小值為961.22.定義在SKIPIF1<0上的函數(shù)SKIPIF1<0滿足:對(duì)任意的SKIPIF1<0,都存在唯一的SKIPIF1<0,使得SKIPIF1<0,則稱函數(shù)SKIPIF1<0是“SKIPIF1<0型函數(shù)”.(1)判斷SKIPIF1<0是否為“SKIPIF1<
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