2020年浙江省金华市高一(上)期中数学试卷解析版
第1页,共12页 期中数学试卷
题号一二三总分
得分
一、选择题(本大题共10小题,共40.0分)
1.直线2x+3y-1=0的斜率为( )
A. B. C.
-1D.
2.在等差数列{a
n}中,a
1=1,公差d=2,则a
8等于( )
A.
13B.
14C.
15D.
16
3.圆心在点C(-2,1),并经过点A(2,-2)的圆的方程是( )
A.
(x-2)2+(y+1)2=5B.
(x-2)2+(y+1)2=25
C.
(x+2)2+(y-1)2=5D.
(x+2)2+(y-1)2=25
4.在△ABC中,角A,B,C的对边分别为a,b,c.若a=3,b=4,,则满足此
条件的三角形( )
A.
不存在B.
有两个C.
有一个D.
个数不确定
5.在各项均为正数的等比数列{a
n}中,a
3=+1,则a
32+2a
2a
6+a
3a
7=(
)
A.
4B.
6C.
8D.
6.设△ABC的内角A,B,C所对的边分别为a,b,c,若a2cosAsinB=b2sinAcosB,则
△ABC的形状为( )
A.
等腰直角三角形B.
直角三角形
C.
等腰三角形或直角三角形D.
等边三角形
7.在平面直角坐标系xOy中,圆C经过点(1,0),(3,0),且与y轴正半轴相
切,若圆C上存在点M,使得直线OM与直线y=kx(k>0)关于x轴对称,则k
的最大值为( )
A. B. C. D.
8.在△ABC中,角A,B,C的对边分别为a,b,c,且acosB=3,bsinA=4,则a=( )
A.
3B.
4C.
5D.
7
9.若方程有且只有一个实数解,则实数m的取值范围为( )
A.
-2≤m<2B.
C.
-2≤m<2或D.
10.已知数列{a
n}满足a
1=1,a
n+1=(n∈N*
),若b
n+1=(n-2λ)•(+1)(n∈N*
),
b
1=-λ,且数列{b
n}是单调递增数列,則实数λ的取值范围是( )
A. B. C. D.
二、填空题(本大题共7小题,共36.0分)
11.在等比数列{a
n}中,若,a
4=-4,则a
7=______,|a
1|+|a
2|+…+|a
n|=______.
12.关于x,y的方程C:x2+y2-2x-4y+m=0.若方程C表示圆,则实数m的取值范围是
______
;在方程
C
表示圆时,若该圆与直线
l
:
x
+2
y
-4=0
相交于
M
,
N
两点,且
,则实数
m
=______
.第2页,共12页13.在△ABC中,角A,B,C的对边分别为a,b,c,且csinB=bcosC=3,则b=______
,若△ABC的面积为,则c=______.
14.设直线l的方程为(a+1)x+y+2-a=0,则直线l经过定点______;若直线l在两坐
标轴上的截距相等,则直线l的方程为______.
15.《莱茵德纸草书》是世界上最古老的数学著作之一.书中有一道这样的题目:把100
个面包分给5个人,使每人所得份量成等差数列,且较大的三份之和的是较小的
两份之和,则最小一份的量为___.
16.如图,四边形AOCB中,OA⊥OC,CA⊥CB,AC=2,
,则OB的长度的取值范围是______.
17.若数列{a
n}满足(q为常数),则称数列{a
n}为等比和数列,q称为
公比和,已知数列{a
n}是以3为公比和的等比和数列,其中a
1=1,a
2=2,则
a
2019=______.
三、解答题(本大题共5小题,共74.0分)
18.已知直线m:2x-y-3=0与直线n:x+y-3=0的交点为P.
(1)求过点P且与直线m垂直的直线l
1的方程;
(2)若直线l
2过点P,且点A(2,3)和点B(1,2)到直线l
2的距离相等,求直
线l
2的方程.
19.在△ABC中,角A,B,C的对边分别为a,b,c,若(a+b)(sinA-sinB)=c(sinA-sinC
).
(1)求角B的大小;
(2)设BC中点为D,且AD=,求a+2c的最大值.
20.已知数列{a
n}是递增的等差数列,a
1+a
5=7,.
(1)求数列{a
n}的通项公式;
(2)记S
n是数列{a
n}的前n项和,求数列的前n项和T
n
.第3页,共12页21.已知圆心在x轴正半轴上的圆C与直线5x+12y+21=0
相切,与y轴交于M,N两点,且∠MCN=120°.
(1)求圆C的标准方程;
(2)过点P(0,2)的直线l与圆C交于不同的两点
A,B,若设点G为△MNG的重心,当△MNG的面积
为时,求直线l的方程.
22.已知数列{a
n}的前n项和为S
n,且满足.
(1)证明:数列{a
n+2}为等比数列,并求数列{a
n}的通项公式;
(2)若b
n=(3n+2)a
n+6n+4,数列{b
n}的前n项和为T
n.求满足不等式
的n
的最小值.第4页,共12页答案和解析
1.
【答案】A
【解析】解:化直线方程2x+3y-1=0为斜截式:即.
∴直线2x+3y-1=0的斜率为-.
故选:A.
化直线方程为斜截式求解.
本题考查由直线的一般式方程求直线的斜率,是基础题.
2.
【答案】C
【解析】解:由题意可得:a
8=1+2×(8-1)=15.
故选;C.
利用等差数列的通项公式即可得出.
本题考查了等差数列的通项公式,考查了推理能力与计算能力,属于基础题.
3.
【答案】D
【解析】解:由所求圆心C的坐标为(-2,1),
设出圆C的方程为(x+2)2+(y-1)2=r2
,
又该圆经过点A(2,-2),
所以把点A的坐标代入圆C的方程得:
(2+2)2+(-2-1)2=r2
,即r2=25,
则圆C的方程为:(x+2)2+(y-1)2=25.
故选:D.
设圆C的半径为r,根据圆心C及设出的半径r设出圆C的标准方程,把A的坐标代入
即可求出r的值,从而确定出圆C的方程.
此题考查了利用待定系数法求圆的方程,要求学生会根据圆心和半径写出圆的标准方程
,本题还有另外解法:利用两点间的距离公式求出|AC|的长即为圆的半径,再根据C的
坐标和求出的半径写出圆C的标准方程.
4.
【答案】A
【解析】解:∵a=3,b=4,,
∴由正弦定理,可得:sinB===>1,
∴B不存在,满足此条件的三角形不存在.
故选:A.
根据正弦定理可求sinB=>1,可得B不存在,由此得解.
本题考查了正弦定理,以及边角关系在解三角形中的应用,属于基础题.
5.
【答案】C
【解析】解:
由等比数列的性质可得第5页,共12页=
=
=
=8
故选:C.
由等比数列的性质可得==,把已知条件代入
即可求解
本题主要考查了等比数列的性质的简单应用,属于基础试题
6.
【答案】C
【解析】解:已知等式利用正弦定理,化简得:ba2cosA=ab2cosB,
整理得:acosA=bcosB,即sinAcosA=sinBcosB,
∴2sinAcosA=2sinBcosB,即sin2A=sin2B,
∴2A=2B或2A+2B=π,即A=B或A+B=,
则△ABC为等腰三角形或直角三角形.
故选:C.
利用正弦定理化简,整理后得到sin2A=sin2B,进而得到2A=2B或2A+2B=π,即可确定
出三角形形状.
此题考查了正弦定理,二倍角的正弦函数公式,熟练掌握正弦定理是解本题的关键,属
于基础题.
7.
【答案】D
【解析】解:如图,
∵圆C经过点(1,0),(3,0),且与y轴正半轴
相切,
∴圆心横坐标为2,半径为2,则圆心纵坐标为
,
∴圆心坐标为(2,),
设过原点与圆相切的直线方程为y=k
1x,
由圆心到直线的距离等于半径,得,解得
k
1=.
∴若圆C上存在点M,使得直线OM与直线y=kx(k>0)关于x轴对称,则k的最大值
为.
故选:D.
由题意画出图形,求出圆C的圆心坐标与半径,再求出过原点与圆相切的直线的斜率,
则答案可求.
本题考查直线与圆的位置关系,考查数形结合的解题思想方法与数学转化思想方法,是
中档题.
2020年浙江省宁波市高一(下)期中数学试卷解析版
第1页,共12页 期中数学试卷
题号一二三总分
得分
一、选择题(本大题共10小题,共40.0分)
1.下列点中,在不等式3x+2y-6>0表示的平面区域内的是( )
A.
(0,0)B.
(1,0)C.
(1,1)D.
(1,2)
2.已知实数列1,x,y,z,5成等差数列,则x+y+z=( )
A.
3B.
6C.
9D.
12
3.在△ABC中,内角A,B,C所对的边分别为a,b,c.若a=1,A=30°,B=45°,则
b的值为( )
A. B. C. D.
2
4.已知实数A,G分别为正实数a,b的等差中项和等比中项,则( )
A.
A≥GB.
A≤GC.
A=GD.
A+G≤0
5.设{a
n}为等比数列,给出四个数列:①{2a
n};②{a
n2};③;④{log
2|a
n|},其
中一定为等比数列的是( )
A.
①②B.
①③C.
②③D.
②④
6.设实数x,y满足,则x+2y的最小值为( )
A.
1.5B.
2C.
5D.
6
7.等比数列的前n项、前2n项、前3n项的积分别为A,B,C,则( )
A.
A×B=C2B.
B2=A×CC.
2B=A+CD.
B3=A3×C
8.已知a,b,c,d是四个互不相等的正实数,满足a+b>c+d,且|a-b|<|c-d|,则下
列选项正确的是( )
A.
a2+b2
>c2 +d2B.
|a2-b2|<|c2-d2|
C.
+<+D.
|-|<|-|
9.在△ABC中,内角A,B,C所对的边分别为a,b,c,已知b=c,a2=b2+c2-2b2sinA
,则A=( )
A. B. C. D.
10.记max{a,b,c}以为实数a,b,c中的最大值.若实数x,y,z满足
,则max{|x|,|y|,|z|}的最大值为( )
A. B.
1C. D.
二、填空题(本大题共7小题,共36.0分)
11.等比数列{a
n}满足a
1=1,a
2=2,则公比q=______;通项公式a
n=______.
12.若正实数x,y满足x+y=1,则xy的最大值等于______:的最小值为______.
2020年浙江省高一(下)期中数学试卷解析版
第1页,共13页 期中数学试卷
题号一二三总分
得分
一、选择题(本大题共10小题,共40.0分)
1.已知全集U={1,2,3,4,5,6},集合A={1,4,5},集合B={2,4,6}则(∁
UA
)∩B=( )
A.
{4}B.
{2,6}C.
{2,4,6}D.
{2,3,6}
2.已知等比数列{a
n},若a
5=2,a
9=32,则a
4•a
10=( )
A.
±16B.
16C.
±64D.
64
3.已知函数,则f(f(-3))=( )
A.
-8B.
9C.
81D.
4
4.已知a>b>0,且c>0,且c≠1,则下列不等式一定成立的是( )
A.
log
ca>log
cbB.
ca
>cbC.
ac>bcD.
5.在△ABC中,内角A,B,C所对的边分别为a,b,c,若A=60°,,,
则C=( )
A.
30°B.
60°C.
60° 或120°D.
30° 或150°
6.已知函数y=f(x)的部分图象如右图,则该函数的解
析式可能是( )
A.
f(x)=x(ex-e-x
)
B.
f(x)=ln(ex+e-x
)
C.
D.
f(x)=ln|x|+1
7.将函数的图象向左平移个单位后得到g(x)的图象,下列是g(
x)的其中一个单调递增区间的是( )
A. B. C. D.
.
8.已知平面向量,满足||=2,||=,且|x+(1-2x)|(x∈R)的最小值,则|+y|
(y∈R)的最小值为( )
A. B.
1C.
2D.
1或2
9.设函数f(x)=ex+ax2+bx+c(a,b,c为非零实数),且f(a)=ea
,f(b)=eb
,若
a<-1,则b的最小值为( )
A.
1B.
2C.
3D.
4
10.若函数f(x)=x2+(m-2)x+|x2-(
m
+2
)
x
+2|
的最小值为
0
,则
m
的取值范围为(
)
A.
(
-∞
,
1]
B.
C.
D. 第2页,共13页二、填空题(本大题共7小题,共36.0分)
11.计算:_______ ;_______.
2020年浙江省高一(下)期中英语试卷解析版
第1页,共12页 期中英语试卷 题号IIIIIIIVV总分得分一、阅读理解(本大题共10小题,共25.0分)AIt was at least two months before Christmas when nine-year-old Almie Rose told her father and me that she wanted a new bicycle. As Christmas drew nearer, her desire for a bicycle seemed to die, or so we thought. We bought some lovely dolls, and a doll house. Then, much to our surprise, on December 23rd, she said that she "really wanted a bike more than anything else." It was just too late, with all the details of preparing Christmas dinner and buying last minute gifts, to take the time to select the "right bike" for our little girl. It was Christmas Eve around 9:00 pm. Almie and her six-year-old brother, Dylan, lay comfortably in their beds. Now we could only think of the bicycle and the disappointment of our child. "What if I make a little bicycle out of clay (黏土) and write a note that she could trade the clay model for a real bike?" her dad asked. "This is an expensive item and she is ‘such a big girl,' it would be much better for her to pick it out." So he spent the next four hours painstakingly (尽心地) working with clay to make a tiny bike. On Christmas morning, we were excited for Almie to open the little heart-shaped package with the beautiful red and white clay bike and the note. Finally, she opened it and read the note aloud. "Does this mean that I trade this bike that Daddy made me for a real one?" Beaming, I said, "Yes." Almie had tears in her eyes when she replied, "I could never trade in this beautiful bicycle that Daddy made me. I'd rather keep this than get a real bike." At that moment, we would have moved heaven and earth to buy her every bicycle on the planet!1.In the end, Almie's parents failed to buy her a new bicycle as a Christmas gift because ______ .A. her desire for a bicycle disappeared graduallyB. they thought dolls were more suitable for her than a bikeC. she preferred the bike made of clayD. her parents had no time to select a "right bike" for her2.What can be inferred from the last sentence of the text? ______ A. The parents were happy and encouraged.B. The parents felt comfortable and relaxed.C. The parents were moved and felt proud of the girl.D. The parents felt disappointed and sorry for the girl.3.What is the best title for the text? ______ A. A Lovely Little Girl.B. A Great and Considerate Father.C. A Clay Bike.D. An Unforgettable Christmas Eve.BApril showers bring May flowers, as the saying goes. And with those flowers comes May Day, a holiday that most people have heard of but have no idea what it's for. 第2页,共12页May Day, celebrated on May 1 every year, has its roots in ancient festivals marking the beginning of summer. Ancient Celts(凯尔特人) called it Beltane, which is still celebrated today. Over the centuries, it gradually developed in Europe, with maypole dances now connected with the holiday. But May Day isn't all about skipping around with ribbons in the sunshine. It has also been on the same day as International Workers' Day since the 1880s. In fact, May Day is equal to America's Labor Day for certain countries. On May 1, 1886, hundreds of thousands of U.S. industrial workers took part in a nationwide strike (罢工) to demand an 8-hour workday.( At the time, it was common to work 10 to 16 hours a day, according to Industrial Workers of the World.) The activities in Chicago lasted for several days, and on May 3, a strike at McCormick Reaper Works ended in a brawl with police officers. Several strikers were wounded or killed. The next night, the violence became even worse. When police came to break up a crowd of people gathered in Haymarket Square, a bomb went off in the policemen. The bomb killed seven of them and wounded 60 more. Police then opened fire on the crowd, killing several men and wounding 200. In honor of these events, now known as the Haymarket Affair, the International Socialist Conference declared May 1 as an international holiday for labor. That's why the world sees not only celebrations of warmer weather on the first day of May, but often marches for labor unions as well.4.According to the text, May Day ______ .A. is celebrated as an international holiday only in EuropeB. is a holiday that many people don't know why it is celebratedC. was developed from celebrations of the beginning of springD. was known as Beltane in history but is not celebrated nowadays5.The underlined word "brawl" in paragraph 4 is closest in meaning to ______ .A. accidentB. partyC. meetingD. fight6.What is the main idea of the text? ______ A. The birth of May Day.B. The importance of May Day.C. The meetings of May Day.D. The celebrations of May Day.CIn one high school biology class, almost four in every 10 low-income students would fail the course. But with some simple practices to reduce test anxiety (焦虑), researchers cut that number in half. Christopher Rozek is a psychologist at Stanford University. He studies how stress and other things can affect learning. Reducing test anxiety had raised test scores in several small studies. So Rozek and his team decided to test it on a larger scale. Rozek's group wanted to know if short stress-relief activities before an exam would affect a student's grade. They tested 1,175 biology students at a large, public high school in Illinois. At this school, a little more than half of low-income students fail their biology finals. Only 6 percent of high-income students fail. They divide the students into four groups. One group spent 10 minutes free-writing about their fears. This was designed to clear the kids' heads so that they could then focus on the exam. Another group read how the body responds to stress and how these can actually help with attention. Then they answered reading comprehension questions. Students in a third group did both of these reading and writing activities. A fourth group, called the active control group, read a passage that told them to just ignore their worries.
2020年浙江省高一(下)期中英语试卷解析版 2
第1页,共12页 期中英语试卷
题号IIIIIIIVV总分
得分
一、阅读理解(本大题共10小题,共25.0分)
A
Do you really care who wins Oscars? On February 24 this year, the Academy Awards
were presented to actors, actresses, directors, musicians and many other people.
Usually they are the "best" and we, the audience, are persuaded that this is true.
This year, the nominations (提名) for Best Picture include Black Panther, Bohemian
Rhapsody and Green Book. According to many people, these are great movies, as are the
performers who bring the stories to life. Whoever wins the award for Best Actor or Best
Actress will undoubtedly become a Hollywood star. However, Leonardo had never won an Oscar before 2016, but that doesn't mean that his
films aren't amazing. I only need to mention Titanic and The Wolf of Wall Street and you
can clearly see that he is an excellent actor. And of course, let's not forget Romeo and
2019-2020学年浙江省金华市东阳中学高一(上)期中数学试卷试题及答案(解析版)
2019-2020学年浙江省金华市东阳中学高一(上)期中数学试卷
一、选择题:本大题共12个小题,每小题5分,共60分.
1.已知集合{|1}Axx,{|0}Bxx,则( )
A.{|0}ABxx B.ABR C.{|1}ABxx D.AB
2.下列函数中,与函数yx相等是( )
A.11()yx B.2()yx C.2yx D.10xylg
3.集合{|42kk剟,}kZ中的角所表示的范围(阴影部分)是( )
A. B.
C. D.
4.函数2()log2fxx的零点是( )
A.(3,0) B.3 C.(4,0) D.4
5.已知1.22a,0.81()2b,2cln,则a,b,c的大小关系为( )
A.cab B.cba C.bac D.bca
6.已知函数4()1(0,1)xfxaaa的图象恒过定点P,若定点P在幂函数()gx的图象上,则幂函数()gx的图象是( )
A. B.
C. D. 7.函数()1sin()()4fxxxR的图象的一条对称轴方程是( )
A.0x B.4x C.4x D.2x
8.函数()log(43)afxax在[1,3]是增函数,则a的取值范围是( )
A.4(0,)9 B.4(,1)9 C.9(,)4 D.9(1,)4
9.已知x,yR,且5757xyyx„,则( )
A.sinsinxy„ B.22xy„
C.55xy„ D.1177loglogxy„
10.已知函数2()|log|fxx,0,01()1|2|,12xgxxx„,则方程|()()|1fxgx的实根个数为( )
A.2个 B.3个 C.4个 D.5个
二、填空题(每题5分,满分35分,将答案填在答题纸上)
11.(1)2225lglg ;
浙江省金华市2020版高一上学期数学期中考试试卷(I)卷
第 1 页 共 9 页 浙江省金华市2020版高一上学期数学期中考试试卷(I)卷
姓名:________ 班级:________ 成绩:________
一、
单选题 (共12题;共24分)
1.
(2分) (2016高一上·周口期末)
已知集合A={x|﹣1<x<3},B={x|﹣2<x<1,x∈z},则A∩B=(
)
A . {0}
B . [﹣1,1]
C . {﹣1,0,1,2}
D . D=[﹣2,3]
2. (2分) (2017·吉林模拟) 设全集U=R,集合A={x|x>1},集合B={x|x>p},若(∁UA)∩B=∅,则p应该满足的条件是( )
A . p>1
B . p≥1
C . p<1
D . p≤1
3. (2分) (2019高一上·湖北期中) 已知函数 的定义域为 ,则 的定义域为( )
A .
B .
C .
D .
4. (2分) (2015高二下·上饶期中) 若函数f(x)=1+ +sinx在区间[﹣k,k](k>0)上的值域为[m,n],则m+n=( ) 第 2 页 共 9 页 A . 0
B . 1
C . 2
D . 4
5.
(2分)
下列各组函数表示同一函数的是(
)
A .
B .
C .
D .
6. (2分) (2016高一上·沽源期中) 已知f(x)是奇函数,当x>0时,f(x)=log2x,则 =( )
A . 2
B . 1
C . ﹣1
D . ﹣2
7. (2分) (2019高三上·集宁期中) 已知 , , ,则实数 , , 的大小关系为( ).
2020年浙江省金华市中考数学试卷(原卷版)
第1页(共6页)
2020年浙江省金华市中考数学试卷
一、选择题(本题有10小题,每小题3分,共30分)
1.(3分)实数3的相反数是( )
A.﹣3 B.3 C.﹣ D.
2.(3分)分式的值是零,则x的值为( )
A.2 B.5 C.﹣2 D.﹣5
3.(3分)下列多项式中,能运用平方差公式分解因式的是( )
A.a2+b2 B.2a﹣b2 C.a2﹣b2 D.﹣a2﹣b2
4.(3分)下列四个图形中,是中心对称图形的是( )
A. B.
C. D.
5.(3分)如图,有一些写有号码的卡片,它们的背面都相同,现将它们背面朝上,从中任意摸出一张,摸到1号卡片的概率是( )
A. B. C. D.
6.(3分)如图,工人师傅用角尺画出工件边缘AB的垂线a和b,得到a∥b.理由是( )
A.连结直线外一点与直线上各点的所有线段中,垂线段最短
B.在同一平面内,垂直于同一条直线的两条直线互相平行
C.在同一平面内,过一点有一条而且仅有一条直线垂直于已知直线
D.经过直线外一点,有且只有一条直线与这条直线平行
第2页(共6页)
7.(3分)已知点(﹣2,a)(2,b)(3,c)在函数y=(k>0)的图象上,则下列判断正确的是( )
A.a<b<c B.b<a<c C.a<c<b D.c<b<a
8.(3分)如图,⊙O是等边△ABC的内切圆,分别切AB,BC,AC于点E,F,D,P是上一点,则∠EPF的度数是( )
A.65° B.60° C.58° D.50°
9.(3分)如图,在编写数学谜题时,“□”内要求填写同一个数字,若设“□”内数字为x.则列出方程正确的是( )
A.3×2x+5=2x B.3×20x+5=10x×2
C.3×20+x+5=20x D.3×(20+x)+5=10x+2
10.(3分)如图,四个全等的直角三角形拼成“赵爽弦图”,得到正方形ABCD与正方形EFGH.连结EG,BD相交于点O、BD与HC相交于点P.若GO=GP,则的值是( )
浙江省金华市2023-2024学年高一上学期期中数学试题含解析
金华2023学年第一学期期中考试
高一数学试题卷
(答案在最后)
一、单选题(本题共8小题,每小题5分,共40分)
1.已知
1,2,2,3PQ
,若
,MxxPxQ
,则M
()
A.
1
B.
2
C.
3
D.
1,2,3
【答案】A
【解析】
【分析】由集合M中元素的特征,对元素进行判断.
【详解】1P且1Q
,则1M;2P且2Q
,则2M,所以
1M
.
故选:A
2.王昌龄是盛唐著名的边塞诗人,被誉为“七绝圣手”,其《从军行》传诵至今,“青海长云暗雪山,孤城遥
望玉门关.黄沙百战穿金甲,不破楼兰终不还”,由此推断,其中最后一句“攻破楼兰”是“返回家乡”的()
A.充分不必要条件B.必要不充分条件
C.充要条件D.既不充分也不必要条件
【答案】B
【解析】
【分析】根据充分条件和必要条件的定义即可求解.
【详解】根据诗意,作者想表达的思想感情是“返回家乡”就一定要“攻破楼兰”,
但是并没有表明“攻破楼兰”后就会“返回家乡”,
所以“攻破楼兰”是“返回家乡”的必要不充分条件.
故选:B.
3.已知命题“Rx,使21
2(1)0
2xax
”是假命题,则实数a
的取值范围是()
A.
1aa
B.
13aa
C.
13aa
D.
31aa
【答案】B
【解析】【分析】由题意可得21
Δ(1)420
2a
,解不等式即可求出答案.【详解】因为命题“Rx,使21
2(1)0
2xax
”是假命题,所以21
2(1)0
2xax恒成立,所以21
Δ(1)420
2a
,
解得13a,
故实数a的取值范围是(1,3)
.
故选:B.
4.若函数
fx
和
gx
分别由下表给出,满足
2gfx
的x
值是()
x
1234
fx
2341
x
1234
gx
2143
A.1B.2C.3D.4
【答案】D
【解析】
【分析】从外到内逐步求值.
【详解】由
2gfx
,则
1fx
,则4x.故选:D
2020年浙江省金华市东阳中学高一(上)期中数学试卷
第1页,共12页 期中数学试卷
题号 一 二 三 总分
得分
一、选择题(本大题共10小题,共40.0分)
1. 直线2x+3y-1=0的斜率为( )
A. B. C. -1 D.
2. 在等差数列{an}中,a1=1,公差d=2,则a8等于( )
A. 13 B. 14 C. 15 D. 16
3. 圆心在点C(-2,1),并经过点A(2,-2)的圆的方程是( )
A. (x-2)2+(y+1)2=5 B. (x-2)2+(y+1)2=25
C. (x+2)2+(y-1)2=5 D. (x+2)2+(y-1)2=25
4. 在△ABC中,角A,B,C的对边分别为a,b,c.若a=3,b=4,,则满足此条件的三角形( )
A. 不存在 B. 有两个 C. 有一个 D. 个数不确定
5. 在各项均为正数的等比数列{an}中,a3=+1,则a32+2a2a6+a3a7=( )
A. 4 B. 6 C. 8 D.
6. 设△ABC的内角A,B,C所对的边分别为a,b,c,若a2cosAsinB=b2sinAcosB,则△ABC的形状为( )
A. 等腰直角三角形 B. 直角三角形
C. 等腰三角形或直角三角形 D. 等边三角形
7. 在平面直角坐标系xOy中,圆C经过点(1,0),(3,0),且与y轴正半轴相切,若圆C上存在点M,使得直线OM与直线y=kx(k>0)关于x轴对称,则k的最大值为( )
A.
B.
C. D.
8. 在△ABC中,角A,B,C的对边分别为a,b,c,且acosB=3,bsinA=4,则a=( )
A. 3 B. 4 C. 5 D. 7
9.
若方程有且只有一个实数解,则实数m的取值范围为(
)
A.
-2≤m<2 B.
C. -2≤m<2或 D.
10. 已知数列{an}满足a1=1,an+1=(n∈N*),若bn+1=(n-2λ)•(+1)(n∈N*),b1=-λ,且数列{bn}是单调递增数列,則实数λ的取值范围是( )
浙江省金华市2020版高一上学期数学期中考试试卷B卷
第 1 页 共 11 页 浙江省金华市2020版高一上学期数学期中考试试卷B卷
姓名:________ 班级:________ 成绩:________
一、
选择题 (共12题;共24分)
1.
(2分)
已知全集U={0,1,2,3,4},集合A={0,1,2,3},B={2,3,4},那么
A . {0,1}
B . {2,3}
C . {0,1,4}
D . {0,1,2,3,4}
2. (2分) (2016高一上·襄阳期中) 下列函数是幂函数且在(0,+∞)上是增函数的是( )
A . y=2x2
B . y=x﹣1
C . y=x
D . y=x3﹣x
3. (2分)
设函数f‘(x)是奇函数f(x)(xR)的导函数,f(-1)=0,当x0时,xf'(x)-f(x)0,则使得f(x)0成立的x的取值范围是( )
A . (- , -1)(0,1)
B . (-1,0)(1,+)
C . (- , -1)(-1,0)
D . (0,1)(1,+)
4. (2分) (2017高一上·安庆期末) 已知函数f(x)满足f(2x)=2f(x),且当1≤x<2时,f(x)=x2 ,
则f(3)=( ) 第 2 页 共 11 页 A .
B .
C .
D . 9
5. (2分) 若一系列函数的解析式相同,值域相同,但定义域不同,则称这些函数为“合一函数”,那么函数解析式为y=2x2﹣1,值域为{1,7}的“合一函数”共有( )
A . 10个
B . 9个
C . 8个
D . 4个
6. (2分) 函数f(x)=loga(1﹣ax)在(1,3)上递增,则a的取值范围是( )
