书书书
【!"#$%& (' 1 ()】
河南名校联盟2020届高三尖子生三月调研考试卷
4567819:
1.【%&】D
【)*】+, A={x{-1<x<1},B={x|x<1
2},-. A∩B={x|-1<x<1
2},/0 D.
2.【%&】B
【)*】(2+i)(1-3i)=2-6i+i-3i2=5-5i,/0 B.
3.【%&】A
【)*】123,log2a>log2ba>b>0,-.456槡a>槡b,7槡a>槡ba>b≥0,-.
“log2a>log2b”8槡a>槡b9:;?@ABC,/0 A.
4.【%&】D
【)*】D tan(α+π
4) 槡=2 2(0<α<π
2),E sin(α+π
4)= 槡22
3 ,cos(α+π
4)=1
3,-.
sinα=sin[(α+π
4)-π
4]=槡2
2sin(α+π
4)-槡2
2cos(α+π
4)= 槡4- 2
6 ,/0 D.
5.【%&】D
【)*】?FGHIJ;KLMNOPQRST=,UQ A(1,1),B(4,1),C(2,3).
V z=x-y,DPWX,YZ[ y=x-z\]^ C_,z`Eabc,abc, -1,/0 D.
6.【%&】C
【)*】defgh ABCD-A1B1C1D1 ;PiOj-J;klWX,B1D∥FO,CE∥A1F,
AE∥C1F,/ A,B,Dfm,Cno,/0 C.
7.【%&】D
【)*】f(x)=sinx+sin2(x+π
4)=sinx+cos2x=sinx+1-2sin2x=-2(sinx-1
4)
2
+9
8,【!"#$%& (' 2 ()】
-. f(x);apc, 9
8,/0 D.
8.【%&】B
【)*】f(x)8qr#,s f(2x)t8qr#,u f(2x)PvwxKy 1
2z{E f(2x+1);P
v,-. f(2x+1);Pv|}Z[ x=-1
2~,/0 B.
9.【%&】D
【)*】'4,S=9,n=2;',S=4,n=3;',S=16,n=4,
/e S;c, 16./0 D.
10.【%&】C
【)*】Yab_,,=L,b;L
,_;, 1+2+ (1+2)2-(2-1)槡 2 槡=3+2 2,-.ab, π×
22×( 槡3+22)=( 槡12+82)π,/0 C.
11.【%&】D
【)*】D23X^ M,N|}^~,V M(s,t),s N(-s,-t),V A(x0,y0),D s2
a2 +t2
b2 =
1,
x2
0
a2 +
y2
0
b2 =1E
t2-y2
0
s2-x2
0
=-b2
a2,-. kAM·kAN =t-y0
s-x0
· -t-y0
-s-x0
=
t2-y2
0
s2-x2
0
=-b2
a2,-.
b2
a2 =1
3, C;, e= 1-b2
a槡 2 =槡6
3,/0 D.
12.【%&】C
【)*】f(x)= 4
2+2x-1=2-2x
2+2x=1-2x-1
1+2x-1,D y=1-2x
1+2x8 r#,WE f(x)Pv|}^(1,
0)~,g(x)=2sinπx;Pvt|}^(1,0)~,r# f(x)= 4
2+2x-1;Pvg(x)=
2sinπx;Pv¡[-8,10]6 19¢^,UQ 1,(1,0),U£ 9~|}^(1,0)~,-
. ∑
k
i=1
xi=19,∑
k
i=1
yi=0,-. ∑
k
i=1
(xi+yi)=19,/0 C.
13.【%&】19
4
【)*】123,m+2n=(3,-2)+(2,2λ)=(5,2λ-2),/(m+2n)·m=0,s 15-
4λ+4=0,)E λ=19
4.
14.【%&】槡2
【)*】¤E|AB|=2ab
c,D |F1F2|=2|AB|E c2 =2ab,¥ c4 =4a2(c2 -a2),¦§E(c2 -
2a2)2=0,-. c2=2a2,e 槡= 2.
15.【%&】( 槡- 3,槡23)
【)*】D 2ccosC=acosB+bcosAE【!"#$%& (' 3 ()】
2sinCcosC=sinAcosB+sinBcosA=sin(A+B)=sinC,+, sinC≠0,-. cosC=1
2,C=π
3,
-. a
sinA= b
sinB= c
sinC=2,-. 2a-b=4sinA-2sinB=4sinA-2sin(A+π
3)=3sinA-
槡3sinA 槡=23sin(A-π
6),+, C=π
3,-. 0<A<2π
3,-π
6<A-π
6<π
2,-1
2<sin(A-π
6)
<1,2a-b;`c¨©8( 槡- 3,槡23).
16.【%&】(-∞,-1)∪(2,+∞)
【)*】D23WE f(x)¡(-∞,+∞)ª8«r#, 8f(x2)=f(x2+3
2),
-. f(x+7
2)<8f(x2)x+7
2<x2+3
2x2-x-2>0x<-1¬ x>2.
17.【)*】(1)VF#®{bn};¯, d,
D a1=4
3,b3=6,E b1=3
2a1=2,-. d=1
2(b3-b1)=2,
-. bn=b1+(n-1)d=2n,an= 2n
2n-1
2n
= 4n2
4n2-1.
(2)+, an= 4n2
4n2-1=1+ 1
4n2-1=1+1
2( 1
2n-1- 1
2n+1),
-. Sn=n+1
2(1-1
3+1
3-1
5+… + 1
2n-1- 1
2n+1)=n+ n
2n+1=2n2+2n
2n+1.
18.【)*】(1)°±K²# x=28×0.05+34×0.15+40×0.45+46×0.25+52×0.10
=41.2.(3=)
(2)Q{# x³¡[37,43)ª,D x=0.05+0.15+x-37
6 ×0.45=0.5,
E x=41.
-.´µ¶·Q{#;¸¹c, 41.(6=)
(3)·º¡[43,49);6 5»,=¼d a,b,c,d,e·º¡[49,55];6 2»,¼d A,B
½¾ 7»Q¿` 2»,
À6:
(a,b),(a,c),(a,d),(a,e),(a,A),(a,B),(b,c),(b,d),(b,e),(b,A),(b,B),(c,d),
(c,e),(c,A),(c,B),(d,e),(d,A),(d,B),(e,A),(e,B),(A,B),Á 21Â.
·º¡[43,49)Ã[49,55]QÄ6 1»;
À6:
(a,A),(a,B),(b,A),(b,B),(c,A),(c,B),(d,A),(d,B),(e,A),(e,B),Á 10Â,
-.-ÅÆ P=10
21.(12=)
19.【)*】(1)+,∠CBA=∠CBD=π
2,-. BC⊥KL ABD,
+, ADKL ABD,-. BC⊥AD.
+, AB=BD,^ E, ADQ^,-. BE⊥AD.
+, BC∩BE=B,-. AD⊥KL BCE,【!"#$%& (' 4 ()】
+, ADKL ACD,-.KL ACD⊥KL BCE.(6=)
(2)D CF=2FDWE CF=2
3CD,
-. VB-CEF =VE-BCE =2
3VE-BCD =2
3VC-BDE,
D(1)X BC⊥KL ABD,
-.ÇÈ C-BDE;, BC, BC=2,
D AB=2,AD 槡=23,^ E, ADQ^,BE⊥ADE
BE= AB2-AE槡 2 =1,
-.△BDE;L S=1
2×BE×ED=1
2 槡×1× 3=槡3
2,
-. VC-BDE =1
3×BC×S=1
3×2×槡3
2=槡3
3,
-. VB-CEF =2
3VC-BDE = 槡23
9 .(12=)
20.【)*】DÉÊ[ C O¢}^ P(1,y0),^ P(1,y0)¡ Oª,
WE y0=±P,Ë(1,±P)¡ÉÊ[ Cª,
)E p=2,-.ÉÊ[ C;gÌ, y2=4x.(4=)
(2)ÍVΡ^ A,.^ D,;]^ O,A,B,
s OA⊥OB,^ D,[Ï ABQ^,
D23X,Z[ OA;ÐΡp} 0,
V OA;gÌ, y=kx(k>0),s OB;gÌ, y=-1
kx,
Ë OgÌ, x2+y2=5,
D
y=kx
x2+y2{ =5E x= 5
1+k槡 2,-.E A( 5
1+k槡 2,k 5
1+k槡 2),
D
y=-1
kx
y2=4{ x
E x=4k2,-.E B(4k2,-4k),
+,^ D,[Ï ABQ^,
-. k 5
1+k槡 2 =4k,¦§E 16k2+11=0,
ÑÒBC; k?Ρ,-.ÓÔBC;^ A?Ρ.(12=)
21.【)*】(1)D f(x)=x-ln(x-a)-a,
E f′(x)=1- 1
x-a=x-a-1
x-a (x>0),
-.Y x∈(a,a+1)_ f′(x)<0,f(x)8r#;
Y x∈(a+1,+∞)_ f′(x)>0,f(x)8«r#.(6=)
(2)D(1)X,f(x)≥f(a+1)=1,【!"#$%& (' 5 ()】
D e-a+a>e-a+a,E e-a<ea,-. a>0.
①Õ 0<a<1,D f(x)≥1WE f(x)=a¡[e-a+a,ea+a]ªÖ6×#Ø;
②Õ a=1,D a+1∈[e-a+a,ea+a]WX,
f(x)=a¡[e-a+a,ea+a]ª6 1×#Ø a+1;
Y a>1_ f(x)¡[e-a+a,a+1]ª8r#,¡(a+1,ea+a]ª8«r#,
D f(a+1)=1<a,f(e-a+a)=e-a+a-ln(e-a+a-a)-a=ea+a>a,
WE f(x)=a¡[e-a+a,a+1]ª64×Ø,
Ë f(ea+a)=ea+a-ln(ea+a-a)-a=ea-a
V g(a)=ea-2a,s g′(a)=ea-2>0,
-. g(a)¡(1,+∞)ª8«r#,-. g(a)>g(1)=e-2>0,
-. ea-2a>0,ea-a>a,
-. f(x)=a¡(a+1,ea+a]ª6 1×Ø,
ÙªWE,Õ 0<a<1,f(x)=a¡[e-a+a,ea+a]ªÖ6×#Ø;Õ a=1,f(x)=a¡[ea
+a,e2a+a]ª6 1×#Ø;Õ a>1_ f(x)=a¡(e-a +a,ea +a]ª6 2×Ø.(12
=)
22.【)*】(1)D^ Q¡ OPÚÛ[ª,|PQ|=3|OP|,
WE →OQ=4→OP,V Q(x,y),s P(x
4,y
4),
D^ P8Ü[ C1ªÝ^,WE
x
4=cosα
y
4=1+sin
{ α
,¥
x=4cosα
y=4+4sin{ α
,
-.^ QÞß C2;à#gÌ,
x=4cosα
y=4+4sin{ α
(α,à#).(5=)
(2)+,Ü[ C1,C2;à#gÌ=,
x=cosα
y=1+sin{ α
,x=4cosα
y=4+4sin{ α
,
áâà# α,EÜ[ C1,C2;ZãäågÌ=, x2+y2-2y=0,x2+y2-8y=0,
D ρ2=x2+y2,ρsinθ=y,EÜ[ C1,C2;æäågÌ=, ρ=2sinθ,ρ=8sinθ,
-.|OA|=2sinπ
3 槡= 3,|OB|=8sinπ
3 槡=43,
-.|AB|=|OB|-|OA 槡|=33.(10=)
23.【)*】(1)Y a=1_,f(x)=|2x-1|+|x+1|=
3x,x≥ 1
2
-x+2,-1<x<1
2
-3x,x≤
{ -1
,
Y x≥ 1
2_,D f(x)>2E 3x>2,-. x>2
3,
Y -1<x<1
2_,D f(x)>2E -x+2>2,-. -1<x<0,【!"#$%& (' 6 ()】
Y x≤ -1_,D f(x)>2E -3x>2,-. x≤ -1,
ÙªE f(x)>2;)ç,(-∞,0)∪(2
3,+∞).(5=)
(2)+, f(x)=|2x-1|+|x+a|≥|x-1
2|+|x-a|≥|(x-1
2)-(x+a)|=|a+1
2|,
Y x=1
2_`Fè,
1
m+ 4
1-m=[m+(1-m)](1
m+ 4
1-m)=5+1-m
m + 4m
1-m≥5+2 1-m
m · 4m
1-槡 m,
-.Ρ x0∈R,~¿3 m∈(0,1)é6 1
m+ 4
1-m>f(x0),
s|a+1
2|<9,-9<a+1
2<9,¥ -19
2<a<17
2
-.×# a;`c¨©8(-19
2,17
2).(10=)