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高一数学试题答案第1页(共5页)三明一中2022—2023学年上学期高一第1次月考数学参考答案及评分细则一、选择题:本题共8小题,每小题5分,共40分.1.C2.B3.D4.C5.B6.C7.A8.B二、选择题:本题共4小题,每小题5分,共20分.全部选对的得5分,有选错的得0分,部
分选对的得3分.9.BCD10.AD11.CD12.ABC三、填空题:本题共4小题,每小题5分,满分20分.13.001,,14.15.216.22,33四、解答题:本
大题共6小题,共70分.解答应写出文字说明、证明过程或演算步骤.17.解:因为fx是二次函数,所以设2(0)fxaxbxca...........................2分由01f,得c=1...................................
....................................................................3分由12fxfxx,得2211112
axbxaxbxx............................5分整理得220axab............................................
...............................................6分所以2200aab,所以11ab..........................................................
..............................8分所以21fxxx........................................................
...........................................10分18.解:(1)当2a时,集合|13Axx.........................................................1
分|13Bxx.........................................................................................................3分所以|13ABxx
...........................................................................................5分(2)若选择①,则ABB①,
则AB........................................................................6分因为|11Axaxa,所以A...............
....................................................7分又|13Bxx,所以1113aa.................................
....................................10分解得02a...............................................................................
...............................11分所以实数a的取值范围是0,2................................................................................12分高一数学试题答案第2
页(共5页)若选择②,“xA“是“xB”的充分不必要条件,则AB.....................................6分因为|11Axaxa,所以A.....................
................................................7分又|13Bxx,所以1113aa,...............................
...................................10分解得02a,...................................................................................................
........11分所以实数a的取值范围是0,2..............................................................................12分若选择③,AB,因为|11Axaxa,|1
3Bxx,所以13a或11a,....................................................................................
......10分解得4a或2a,.......................................................................................
............11分所以实数a的取值范围是[,24,)..........................................................12分19.解:(1)函数()fx在0,上单
调递增........................................................1分证明:22(1)22()2111xxfxxxx..................
.......................................2分任取1212,0,,xxxx且...............................................................................
....3分则121221122221111xxfxfxxxxx................................................4分由120xx得,12120,10,
10xxxx,所以12fxfx........................................5分故()fx在0,上单调递增。......................
.........................................................6分(2)因为()fx在0,上单调递增,所以(21)(1)fmfm等价于21010211mmmm
.............................................................................................................9分213m解得...........
..................................................................................................11分故实
数m的取值范围2,13.......................................................................................12分高一数学试题答案第3页(共5页)20.
解:(1)由已知得:1510201530fxWxxxWxx....................................................2分故29030360,021080108030,261xxxfxxxx
................................................................................4分(2)若02x,则22117159030360903362fxx
xxx,.............................5分此时,对称轴为16x,故fx有最大值为2660f..............................................6分若26x,则10
801080108030111030111fxxxxx............................7分108011102301111021807501xx,..................
..........................................9分当且仅当10803011xx,即5x时等号成立,.........................................
...................10分此时,fx有最大值为5750f,................................................................................11分综上有,fx有最大值为
750,∴当施用肥料为5千克时,该水果树的单株利润最大,最大利润是750元..................12分21.解:(1)由题意可知:方程2230axbx的两根是1,1............................
..........2分所以21103(1)11baa...............................................................................................4分解
得32ab.........................................................................................
...........................5分(2)由10f得1ba......................................................
...............................................6分xR,4fx成立,即使2210axbx恒成立,又因为1ba,代入上式可得2310axax恒成立..............
.......................7分高一数学试题答案第4页(共5页)当0a时,显然上式不恒成立;................................................................................8分当0a时,要使
2310axax恒成立所以20Δ340aaa...............................................................
............................10分解得91a..............................................................................
..............................11分综上可知a的取值范围是9,1..........................................................................12分22.解:(1)5fx解集
为3,12......................................................................4分(2)证明:2115152488fxx
............................................................................5分min8815()3558fx,所以235mm..........................
...................................6分解得12m,所以2M,所以332ab..........................................
................7分因为33222ababaabb...........................................................................8分222213024aabbabb
.................................................................................9分所以0ab,由24abab得,
23221234abaabbabababab则2ab,当且仅当ab时,等号成立..........................................................
........11分综上所述,02ab................................................................................................
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