书书书
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2019—2020$'()'*+,-.())
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1.【/0】C
【12】3 sinπ
3=sin2π
3 =sin8π
3 =槡3
2,sin4π
3 =-槡3
2,45 A∩B={π
3,2π
3,8π
3},67 C.
2.【/0】B
【12】a+i
1-2i=(a+i)(1+2i)
5 =a-2
5 +2a+1
5 i,89 a+i
1-2i(a∈R):;?@AB:CD y
=xE,FGa-2
5 =2a+1
5 ,FG a=-3,67 B.
3.【/0】A
【12】H(x-2)2 +(y-1)2 =1IJKLD C:x2
a-y2
3=1(a>0)AMNOPD?Q,RHS
(2,1):OPD y= 3
槡axE,FG 1=2 3
槡a,a=12,FGKLD CATUV9 2槡a 槡=4 3,
67 A.
4.【/0】A
【12】89 a=2log32=log34<log3 槡27=3
2,c=log23=log2槡9>log2槡8=3
2,FG a<b<c,6
7 A.
5.【/0】B
【12】3WX,X~B(3,1
5),FG EX=3×1
5=3
5,67 B.
6.【/0】C
【12】3 f(x)=
1,x>0
0,x=0
-1,x{ <0
,g(x)=sinπx,45Y x>0Z,g(f(x))=g(1)=sinπ=0,Y x=0
Z,g(f(x))=g(0)=sin0=0,Y x<0Z g(f(x))=g(-1)=sin(-π)=0,FG A[\;Y x
>0Z,f(x)=1,f(f(x))=f(1)=1,f(f(x))=f(x)]^,Y x=0Z,f(0)=0,f(f(0))=f(0)=
0,f(f(x))=f(x)]^,Y x<0Z,f(x)=-1,f(f(x))=f(-1)=-1,f(f(x))=f(x)]^,F
G B[\,3 f(3
2)g(3
2)=-1,4_ C`a,3 g(x)≥ -1,g(x)+2≥1,4_ f(g(x)+2)=1
[\,67 C.
7.【/0】D
【12】89 f(x)=ex,g(x)=x3-ax,FG f′(x)=ex,g′(x)=3x2 -a,3 f(x)=ex: x=0bA
cDdLDg(x)=x3-ax: x=1bAcD