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2019-2020学年人教A版甘肃省兰州一中高二第一学期期末(理科)数学试卷 含解析

2019-2020学年人教A版甘肃省兰州一中高二第一学期期末(理科)数学试卷 含解析
2019-2020学年人教A版甘肃省兰州一中高二第一学期期末(理科)数学试卷 含解析

2019-2020学年高二第一学期期末数学试卷(理科)

一、选择题

1.下列命题:

①“全等三角形的面积相等”的逆命题;

②“若ab=0,则a=0”的否命题;

③“正三角形的三个角均为60°”的逆否命题.

其中真命题的个数是()

A.0个B.1个C.2个D.3个

2.命题“?n∈N*,f(n)∈N*且f(n)≤n”的否定形式是()

A.?n∈N*,f(n)?N*且f(n)>n

B.?n∈N*,f(n)?N*或f(n)>n

C.?n0∈N*,f(n0)?N*且f(n0)>n0

D.?n0∈N*,f(n0)?N*或f(n0)>n0

3.抛物线y=4x2的焦点到准线的距离为()

A.2 B.1 C.D.

4.已知命题P:?x∈R,x2+2ax+a≤0.若命题P是假命题,则实数a的取值范围是()A.(0,1)B.(﹣∞,0)∪(1,+∞)

C.[0,1] D.(﹣∞,0)∪[1,+∞)

5.若k∈R,则方程表示焦点在x轴上的双曲线的充要条件是()A.﹣3<k<﹣2 B.k<﹣3 C.k<﹣3或k>﹣2 D.k>﹣2

6.若椭圆的中心在原点,一个焦点为(0,2),直线y=3x+7与椭圆相交所得弦的中点的纵坐标为1,则这个椭圆的方程为()

A.+=1 B.+=1

C.+=1 D.+=1

7.2x2﹣5x﹣3<0的一个必要不充分条件是()

A.﹣<x<3 B.﹣<x<0 C.﹣3<x<D.﹣1<x<6

8.双曲线C的渐近线方程为y=±,一个焦点为F(0,﹣),点A(,0),点P为双曲线第一象限内的点,则当P点位置变化时,△PAF周长的最小值为()A.8 B.10 C.D.

9.在棱长为1的正四面体ABCD中,E,F分别是BC,AD中点,则=()A.0 B.C.D.

10.不等式<1的解集记为p,关于x的不等式x2+(a﹣1)x﹣a>0的解集记为q,若p是q的充分不必要条件,则实数a的取值范围是()

A.(﹣2,﹣1] B.[﹣2,﹣1]

C.(﹣∞,﹣2]∪[﹣1,+∞)D.(﹣∞,﹣2)∪(﹣1,+∞)

11.已知直线l的斜率为k,它与抛物线y2=4x相交于A、B两点,F为抛物线的焦点,=3,则|k|=()

A.2B.C.D.

12.已知点F为双曲线E:=1(a,b>0的右焦点,直线y=kx(k>0)与E交于M,N两点,若MF⊥NF,设∠MNF=β,且β∈[],则该双曲线的离心率的取值范围是()

A.[] B.[2,] C.[2,] D.[] 二、填空题(本题共4小题.)

13.已知=(1,2,﹣y),=(x,1,2),且(+2)∥(2﹣),则x+y=.14.若点O和点F分别为椭圆+=1的中心和左焦点,点P为椭圆上的任一点,则?的最小值为.

15.我国古代数学著作《九章算术》有如下问题:“今有人持金出五关,前关二而税一,次关三而税一,次关四而税一,次关五而税一,次关六而税一,并五关所税,适重一斤,问本持金几何”其意思为“今有人持金出五关,第1关收税金,第2关收税金为剩余金的,第3关收税金为剩余金的,第4关收税金为剩余金的,第5关收税金为剩

余金的,5关所收税金之和,恰好重1斤,问原来持金多少?”若将题中“5关所收税金之和,恰好重1斤,问原来持金多少?”改成假设这个原来持金为x,按此规律通过第8关,则第8关需收税金为x.

16.过双曲线﹣=1(a>0,b>0)的右焦点F作渐近线的垂线,设垂足为P(P为第一象限的点),延长FP交抛物线y2=2px(p>0)于点Q,其中该双曲线与抛物线有一个共同的焦点,若=(+),则双曲线的离心率的平方为.

三、解答题(本大题共6小题)

17.已知命题p:函数y=x2+mx+1在(﹣1,+∞)上单调递增,命题q:对函数y=﹣4x2+4(2﹣m)x﹣1,y≤0恒成立.若p∨q为真,p∧q为假,求m的取值范围.

18.如图,直棱柱ABC﹣A1B1C1中,D,E分别是AB,BB1的中点,AA1=AC=CB=AB.(Ⅰ)证明:BC1∥平面A1CD

(Ⅱ)求二面角D﹣A1C﹣E的正弦值.

19.已知抛物线C:y2=2px(p>0)过点A(1,﹣2).

(1)求抛物线C的方程,并求其准线方程;

(2)若平行于OA(O为坐标原点)的直线l与抛物线C相交于M、N两点,且|MN|=3.求△AMN的面积.

20.如图,在三棱锥P﹣ABC中,AB=BC=2,PA=PB=PC=AC=4,O为AC的中点.(1)证明:PO⊥平面ABC;

(2)若点M在棱BC上,且二面角M﹣PA﹣C为30°,求PC与平面PAM所成角的余弦值.

21.已知椭圆C1的方程为+y2=1,双曲线C2的左、右焦点分别是C1的左、右顶点,而C2的左、右顶点分别是C1的左、右焦点.

(1)求双曲线C2的方程;

(2)若直线l:y=kx+与双曲线C2恒有两个不同的交点A和B,且?>2(其中O为原点),求k的取值范围.

22.已知椭圆C:+=1(a>b>0)的两个焦点分别为F1(﹣,0),F2(,0),点M(1,0)与椭圆短轴的两个端点连线相互垂直.

(1)求椭圆C的方程;

(2)过点M(1,0)的直线l与椭圆C相交于A,B两点,设点N(3,2),记直线AN,BN的斜率分别为k1,k2,求证:k1+k2为定值.

参考答案

一、选择题(本大题共12小题)

1.下列命题:

①“全等三角形的面积相等”的逆命题;

②“若ab=0,则a=0”的否命题;

③“正三角形的三个角均为60°”的逆否命题.

其中真命题的个数是()

A.0个B.1个C.2个D.3个

【分析】写出①命题的逆命题判断正误;写出②的否命题判断正误;直接判断③的正误,即可得到选项.

解:①“全等三角形的面积相等”的逆命题:面积相等的三角形是全等三角形,显然逆命题不正确;

②“若ab=0,则a=0”的否命题:若ab≠0,则a≠0,是正确命题;

③“正三角形的三个角均为60°”的逆否命题.原命题与逆否命题同真同假,原命题是

真命题,所以正确.

真命题是②③.

故选:C.

2.命题“?n∈N*,f(n)∈N*且f(n)≤n”的否定形式是()

A.?n∈N*,f(n)?N*且f(n)>n

B.?n∈N*,f(n)?N*或f(n)>n

C.?n0∈N*,f(n0)?N*且f(n0)>n0

D.?n0∈N*,f(n0)?N*或f(n0)>n0

【分析】根据全称命题的否定是特称命题即可得到结论.

解:命题为全称命题,

则命题的否定为:?n0∈N*,f(n0)?N*或f(n0)>n0,

故选:D.

3.抛物线y=4x2的焦点到准线的距离为()

A.2 B.1 C.D.

【分析】将抛物线转化标准方程,根据抛物线的性质,求得焦点及准线方程,即可求得焦点到准线的距离.

解:抛物线的标准方程x2=y,则焦点坐标为(,0),准线方程为x=﹣,∴焦点到准线的距离d=P=,

故选:D.

4.已知命题P:?x∈R,x2+2ax+a≤0.若命题P是假命题,则实数a的取值范围是()A.(0,1)B.(﹣∞,0)∪(1,+∞)

C.[0,1] D.(﹣∞,0)∪[1,+∞)

【分析】根据命题P是假命题得到命题¬P是真命题,然后建立条件即可求出a的取值范围.

解:∵命题P是假命题,

∴命题¬P是真命题,

即?x∈R,x2+2ax+a>0恒成立,

即△=4a2﹣4a<0,

解得0<a<1,

故选:A.

5.若k∈R,则方程表示焦点在x轴上的双曲线的充要条件是()A.﹣3<k<﹣2 B.k<﹣3 C.k<﹣3或k>﹣2 D.k>﹣2

【分析】方程表示焦点在x轴上的双曲线的充要条件是k+3>0>k+2,解出即可.

解:方程表示焦点在x轴上的双曲线的充要条件是k+3>0>k+2,解得﹣3<k<﹣2.

故选:A.

6.若椭圆的中心在原点,一个焦点为(0,2),直线y=3x+7与椭圆相交所得弦的中点的纵坐标为1,则这个椭圆的方程为()

A.+=1 B.+=1

C.+=1 D.+=1

【分析】由题意设出椭圆方程,和直线方程联立后化为关于y的一元二次方程,然后利用根与系数关系求解.

解:∵椭圆的中心在原点,一个焦点为(0,2),

则a2﹣b2=4,

∴可设椭圆方程为,

联立,得(10b2+4)y2﹣14(b2+4)y﹣9b4+13b2+196=0,

设直线y=3x+7与椭圆相交所得弦的端点为(x1,y1),(x2,y2),

∴.

解得:b2=8.

∴a2=12.

则椭圆方程为:.

故选:D.

7.2x2﹣5x﹣3<0的一个必要不充分条件是()

A.﹣<x<3 B.﹣<x<0 C.﹣3<x<D.﹣1<x<6 【分析】通过解二次不等式求出2x2﹣5x﹣3<0的充要条件,通过对四个选项的范围与充要条件的范围间的包含关系的判断,得到2x2﹣5x﹣3<0的一个必要不充分条件.解:2x2﹣5x﹣3<0的充要条件为

对于A是2x2﹣5x﹣3<0的充要条件

对于B,是2x2﹣5x﹣3<0的充分不必要条件

对于C,2x2﹣5x﹣3<0的不充分不必要条件

对于D,是2x2﹣5x﹣3<0的一个必要不充分条件

故选:D.

8.双曲线C的渐近线方程为y=±,一个焦点为F(0,﹣),点A(,0),点P为双曲线第一象限内的点,则当P点位置变化时,△PAF周长的最小值为()A.8 B.10 C.D.

【分析】利用已知条件求出a,b求出双曲线方程,利用双曲线的定义转化求解三角形的最小值即可.

解:双曲线C的渐近线方程为y=±,一个焦点为,可得,c==,a=2,b=.

双曲线方程为,设双曲线的上焦点为F',

则|PF|=|PF'|+4,△PAF的周长为|PF|+|PA|+|AF|=|PF'|+4+|PA|+3,

当P点在第一象限时,|PF'|+|PA|的最小值为|AF'|=3,

故△PAF的周长的最小值为10.

故选:B.

9.在棱长为1的正四面体ABCD中,E,F分别是BC,AD中点,则=()A.0 B.C.D.

【分析】欲求,先把要求数量积的两个向量表示成以四面体的棱所在向量为基底的向量的表示形式,写出向量的数量积,问题转化成四面体的棱向量之间的关系,因为棱长及其夹角可知,从而得到结果.

解:=

=﹣

故选:D.

10.不等式<1的解集记为p,关于x的不等式x2+(a﹣1)x﹣a>0的解集记为q,若p是q的充分不必要条件,则实数a的取值范围是()

A.(﹣2,﹣1] B.[﹣2,﹣1]

C.(﹣∞,﹣2]∪[﹣1,+∞)D.(﹣∞,﹣2)∪(﹣1,+∞)

【分析】分别解出p,q,利用p是q的充分不必要条件即可得出.

解:不等式<1,即>0,化为(x﹣1)(x﹣2)>0,解得x>2或x<1,解集p=(﹣∞,1)∪(2,+∞),

关于x的不等式x2+(a﹣1)x﹣a>0,化为(x+a)(x﹣1)>0,解集记为q,

若p是q的充分不必要条件,则1≤﹣a<2,解得﹣2<a≤﹣1.

则实数a的取值范围是(﹣2,﹣1].

故选:A.

11.已知直线l的斜率为k,它与抛物线y2=4x相交于A、B两点,F为抛物线的焦点,=3,则|k|=()

A.2B.C.D.

【分析】设A在第一象限,A、B在准线上的射影分别为M,N,过B作BE⊥AM与E,根据抛物线定义,可得:AF=AM=3m,BN=BF=m,BAF=60°,k=,当A在第四象限时,可得k=﹣.

解:设A在第一象限,如图,设A、B在准线上的射影分别为M,N,

过B作BE⊥AM与E,根据抛物线定义,可得:

AF=AM=3m,BN=BF=m,∴AE=2m,

又AB=4m,∴∠EAF=60°,

k=,

当A在第四象限时,可得k=﹣.

故选:B.

12.已知点F为双曲线E:=1(a,b>0的右焦点,直线y=kx(k>0)与E交于M,N两点,若MF⊥NF,设∠MNF=β,且β∈[],则该双曲线的离心率的取值范围是()

A.[] B.[2,] C.[2,] D.[] 【分析】由直角三角形的斜边的中线长为斜边的一半,取双曲线的左焦点F',连接MF',NF',可得四边形MFNF'为矩形,由双曲线的定义和解直角三角形,结合余弦函数的图象和性质,即可得到所求范围.

解:由MF⊥NF可得|OM|=|ON|=|OF|=c,

取双曲线的左焦点F',连接MF',NF',

可得四边形MFNF'为矩形,

即有|NF|=|MF'|=2c cosβ,|MF|=2c sinβ,

由双曲线的定义可得2a=|MF'|﹣|MF|=2c cosβ﹣2c sinβ,

可得e===,

由β∈[],可得β+∈[,],

即有cos(β+)∈[,],

即有e的范围是[,1+],

故选:D.

二、填空题(本大题共4小题,每小题5分,共20分,将答案写在答题卡上.)

13.已知=(1,2,﹣y),=(x,1,2),且(+2)∥(2﹣),则x+y=.【分析】利用向量坐标运算性质、向量共线定理即可得出.

解:+2=(1+2x,4,﹣y+4)

2﹣=(2﹣x,3,﹣2y﹣2),

∵(+2)∥(2﹣),

∴存在实数k使得+2=k(2﹣),

∴,

解得x=,y=﹣4.

∴x+y=﹣,

故答案为:﹣.

14.若点O和点F分别为椭圆+=1的中心和左焦点,点P为椭圆上的任一点,则?的最小值为 6 .

【分析】求得椭圆的a,b,c,设P(m,n),(﹣3≤m≤3),运用向量的数量积的坐标表示和二次函数的最值求法,注意运用椭圆的范围,可得所求最小值.

解:椭圆+=1的a=3,b=2,c=1,

设P(m,n),(﹣3≤m≤3),可得n2=8﹣,

由F(﹣1,0),可得?=(m,n)?(m+1,n)=m(m+1)+n2=m2+m+8﹣=+m+8=(m+)2+,

由﹣?[﹣3,3],可得m=﹣3时,取得最小值1﹣3+8=6,

故答案为:6.

15.我国古代数学著作《九章算术》有如下问题:“今有人持金出五关,前关二而税一,次关三而税一,次关四而税一,次关五而税一,次关六而税一,并五关所税,适重一斤,问本持金几何”其意思为“今有人持金出五关,第1关收税金,第2关收税金为剩余金的,第3关收税金为剩余金的,第4关收税金为剩余金的,第5关收税金为剩余金的,5关所收税金之和,恰好重1斤,问原来持金多少?”若将题中“5关所收税金之和,恰好重1斤,问原来持金多少?”改成假设这个原来持金为x,按此规律通过第8关,则第8关需收税金为x.

【分析】第1关收税金:x;第2关收税金:(1﹣)x=x;第3关收税金:(1﹣﹣)x=x;…,可得第8关收税金.

解:第1关收税金:x;第2关收税金:(1﹣)x=x;第3关收税金:(1﹣﹣)x=x;

…,可得第8关收税金:x,即x.

故答案为:.

16.过双曲线﹣=1(a>0,b>0)的右焦点F作渐近线的垂线,设垂足为P(P为第一象限的点),延长FP交抛物线y2=2px(p>0)于点Q,其中该双曲线与抛物线有一个共同的焦点,若=(+),则双曲线的离心率的平方为.【分析】由=(+),可得P为FQ的中点,设F(c,0),一条渐近线方程和垂直的垂线方程,求得交点P的坐标,由中点坐标公式可得Q的坐标,代入抛物线的方

程,结合离心率公式,解方程可得所求值.

解:由=(+),可得P为FQ的中点,

设F(c,0),由渐近线方程y=x,①

可设直线FP的方程为y=﹣(x﹣c),②

由①②解得P(,),

由中点坐标公式可得Q(﹣c,),

代入抛物线的方程可得=2p?(﹣c),③

由题意可得c=,即2p=4c,

③即有c4﹣a2c2﹣a4=0,

由e=,可得e4﹣e2﹣1=0,

解得e2=.

故答案为:.

三、解答题(本大题共6小题,共70分)

17.已知命题p:函数y=x2+mx+1在(﹣1,+∞)上单调递增,命题q:对函数y=﹣4x2+4(2﹣m)x﹣1,y≤0恒成立.若p∨q为真,p∧q为假,求m的取值范围.

【分析】求出两个命题是真命题时,m的范围,利用复合命题的真假,推出一真一假,然后求解即可.

【解答】

解:若函数y=x2+mx+1在(﹣1,+∞)上单调递增,则﹣≤﹣2,

∴m≥2,即p:m≥2.…

若函数y=﹣4x2+4(2﹣m)x﹣1≤0恒成立,

则△=16(m﹣2)2﹣16≤0,

解得1≤m≤3,即q:1≤m≤3 …

∵p∨q为真,p∧q为假,∴p、q一真一假

当p真q假时,由解得:m>3 …

当p假q真时,由解得:1≤m<2

综上,m的取值范围是{m|m>3或1≤m<2}.…

18.如图,直棱柱ABC﹣A1B1C1中,D,E分别是AB,BB1的中点,AA1=AC=CB=AB.(Ⅰ)证明:BC1∥平面A1CD

(Ⅱ)求二面角D﹣A1C﹣E的正弦值.

【分析】(Ⅰ)通过证明BC1平行平面A1CD内的直线DF,利用直线与平面平行的判定定理证明BC1∥平面A1CD

(Ⅱ)证明DE⊥平面A1DC,作出二面角D﹣A1C﹣E的平面角,然后求解二面角平面角的正弦值即可.

解:(Ⅰ)证明:连结AC1交A1C于点F,则F为AC1的中点,

又D是AB中点,连结DF,则BC1∥DF,

因为DF?平面A1CD,BC1?平面A1CD,

所以BC1∥平面A1CD.

(Ⅱ)因为直棱柱ABC﹣A1B1C1,所以AA1⊥CD,

由已知AC=CB,D为AB的中点,所以CD⊥AB,

又AA1∩AB=A,于是,CD⊥平面ABB1A1,

设AB=2,则AA1=AC=CB=2,得∠ACB=90°,

CD=,A1D=,DE=,A1E=3

故A1D2+DE2=A1E2,即DE⊥A1D,所以DE⊥平面A1DC,

又A1C=2,过D作DF⊥A1C于F,∠DFE为二面角D﹣A1C﹣E的平面角,

在△A1DC中,DF==,EF==,

所以二面角D﹣A1C﹣E的正弦值.sin∠DFE=.

19.已知抛物线C:y2=2px(p>0)过点A(1,﹣2).

(1)求抛物线C的方程,并求其准线方程;

(2)若平行于OA(O为坐标原点)的直线l与抛物线C相交于M、N两点,且|MN|=3.求△AMN的面积.

【分析】(1)点的坐标代入方程求出p即可得到抛物线方程.然后求解准线方程.(2)设出直线方程,联立直线与抛物线方程,利用韦达定理以及弦长公式求出t,求出点到直线的距离,然后求解三角形面积.

解:(1)将(1,﹣2)代入y2=2px,得(﹣2)2=2p?1,所以p=2.

故抛物线方程为y2=4x,准线为x=﹣1.…

(2)设直线l的方程为y=﹣2x+t,

由,得y2+2y﹣2t=0.∴y1+y2=﹣2,y1y2=﹣2t,….

∵直线l与抛物线C有公共点,∴△=4+8t≥0,解得t≥﹣.

由|MN|==3得t=4,…

又A到直线l的距离为d=…

∴△AMN的面积为S=|MN|﹒d=6.…

20.如图,在三棱锥P﹣ABC中,AB=BC=2,PA=PB=PC=AC=4,O为AC的中点.(1)证明:PO⊥平面ABC;

(2)若点M在棱BC上,且二面角M﹣PA﹣C为30°,求PC与平面PAM所成角的余弦值.

【分析】(1)推导出OP⊥AC,OB⊥AC,PO⊥OB.由此能证明PO⊥平面ABC.

(2)以O为坐标原点,的方向为x轴正方向,建立空间直角坐标系O﹣xyz.利用向量法能求出PC与平面PAM所成角的正弦值.

解:(1)证明因为AP=CP=AC=4,O为AC的中点,所以OP⊥AC,且OP=2.

连接OB,因为AB=BC=AC,

所以AB2+BC2=AC2,

所以△ABC为等腰直角三角形,

且OB⊥AC,OB=AC=2.

由OP2+OB2=PB2知PO⊥OB.

由OP⊥OB,OP⊥AC且OB∩AC=O,知PO⊥平面ABC…

(2)解:如图,以O为坐标原点,的方向为x轴正方向,建立空间直角坐标系O﹣xyz.由已知得O(0,0,0),B(2,0,0),A(0,﹣2,0),C(0,2,0),P(0,0,2),

=(0,2,2).取平面PAC的一个法向量=(2,0,0).

设M(a,2﹣a,0)(0<a≤2),则=(0,4﹣a,0).

设平面PAM的法向量为=(x,y,z).

由?=0,?=0,得,取=((a﹣4),a,﹣a),∵二面角M﹣PA﹣C为30°,∴cos<>==cos30°=,

解得a=﹣4(舍)或a=,∴=(﹣,,﹣),

∵=(0,2,﹣2),∴cos<>==,

∴PC与平面PAM所成角的正弦值为.

21.已知椭圆C1的方程为+y2=1,双曲线C2的左、右焦点分别是C1的左、右顶点,而C2的左、右顶点分别是C1的左、右焦点.

(1)求双曲线C2的方程;

(2)若直线l:y=kx+与双曲线C2恒有两个不同的交点A和B,且?>2(其中O为原点),求k的取值范围.

【分析】(1)设出双曲线的标准方程,根据根据椭圆方程求得双曲线的左右顶点和焦点,进而求得双曲线方程中的a和b,则双曲线方程可得.

(2)将直线代入双曲线方程消去y,进而根据判别式求得k的范围,设出A,B的坐标,根据韦达定理求得x1+x2和x1x2的表达式,进而根据?>2求得关于k的不等式,求得k的范围,最后综合求得答案.

解:(1)设双曲线C2的方程为﹣=1,

则a2=4﹣1=3,c2=4,

由a2+b2=c2,得b2=1,

故C2的方程为﹣y2=1.

(2)将y=kx+代入﹣y2=1,得

(1﹣3k2)x2﹣6kx﹣9=0.

由直线l与双曲线C2交于不同的两点,得

∴k2≠且k2<1.①

设A(x1,y1),B(x2,y2),则

x1+x2=,x1x2=.

∴x1x2+y1y2=x1x2+(kx1+)(kx2+)

=(k2+1)x1x2+k(x1+x2)+2=.

又∵?>2,得x1x2+y1y2>2,

∴>2,

即>0,解得<k2<3,②

由①②得<k2<1,

故k的取值范围为(﹣1,﹣)∪(,1).

22.已知椭圆C:+=1(a>b>0)的两个焦点分别为F1(﹣,0),F2(,0),点M(1,0)与椭圆短轴的两个端点连线相互垂直.

(1)求椭圆C的方程;

(2)过点M(1,0)的直线l与椭圆C相交于A,B两点,设点N(3,2),记直线AN,BN的斜率分别为k1,k2,求证:k1+k2为定值.

【分析】(Ⅰ)依题意,,a2﹣b2=2,利用点M(1,0)与椭圆短轴的两个端点的连线相互垂直,可得b=|OM|=1,从而可得椭圆的方程;

(II)①当直线l的斜率不存在时,求出A,B的坐标,进而可得直线AN,BN的斜率,即可求得结论;②当直线l的斜率存在时,直线l的方程为:y=k(x﹣1),代入,利用韦达定理及斜率公式可得结论.

解:(Ⅰ)依题意,,a2﹣b2=2,

∵点M(1,0)与椭圆短轴的两个端点的连线相互垂直,

∴b=|OM|=1,

∴.

∴椭圆的方程为.

(II)①当直线l的斜率不存在时,由解得.

设,,则为定值.

②当直线l的斜率存在时,设直线l的方程为:y=k(x﹣1).

将y=k(x﹣1)代入整理化简,得(3k2+1)x2﹣6k2x+3k2﹣3=0.

依题意,直线l与椭圆C必相交于两点,设A(x1,y1),B(x2,y2),

则,.

又y1=k(x1﹣1),y2=k(x2﹣1),

所以=

==

==.

综上得k1+k2为常数2.

人教版2020学年高二英语上学期期末考试试题新 人教

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