1
的等比数列, 那
么a n = ······························································································ ( )
(A)⎪⎭
⎫ ⎝
⎛
-
-131132n (B)⎪⎭
⎫ ⎝⎛-
-131123n (C)⎪⎭
⎫ ⎝⎛-
n 31132 (D)⎪⎭
⎫ ⎝⎛-
n 31123 3.已知{a n }为等差数列,{b n }为等比数列,其公比q ≠1,且b i >0(i=1,2,3,…n ),若a 1=b 1, a 11=b 11,则 ·················································································· ( ) (A)a 6=b 6 (B) a 6>b 6 (C) a 6b 6或a 6
4.设f (x )=ax 2+bx +c (a >0)满足f (1+x )=f (1-x ),则f (2x )与f (3x )的大小关系为 ··· ( )
(A) f (3x )≥ f (2x )(B) f (3x )≤ f (2x ) (C) f (3x )< f (2x ) (D)不确定
5.已知数列{a n }的前n 项和为S n =1-5+9-13+17-21+…+(-1)n -1(4n -3),则S 15+S 22-S 31
的值是 ······················································································· ( )
(A)13
(B)46
(C)-76
(D)76
6.若不等式x 2-log m x <0在区间(0,
2
1
)内恒成立,则实数m 的取值范围是 ····· ( ) (A) m ≥
16
1 (B)016
1 (C)04
1 (D)
16
1
≤m <1 7.函数),2
,0)(sin(R x x A y ∈π
<
ϕ>ωϕ+ω=的部分图象如图所示,则函数表达式为( )
(A ))48sin(
4π+π-=x y (B ))48sin(4π-π=x y (C ))48sin(4π-π-=x y (D ))4
8sin(4π
+π=x y
8.若{a n }是等差数列,首项a 1>0,a 20XX +a 20XX >0,a 20XX ·a 20XX <0,则使前n 项和S n >0
成立的最大自然数n 是 ································································· ( ) (A)4020XX (B)4020XX (C)4020XX (D)4020XX 9.已知函数)(x f 是R 上的增函数,A (0,-1)、B (3,1)是其图象上的两点,则1|)1(|<+x f 的解集是( )
A 、 (]()+∞⋃-∞-,41,
B 、)4,1(-
C 、)2,1(-
D 、(]()+∞⋃-∞-,21,
10.若关于x 的方程043)4(9=+⋅++x
x
a 有实解,则实数a 的取值范围是( )
A 、(-∞,-8)
B 、[),8+∞-
C 、(8,-∞-]
D 、),(+∞-∞ 11.函数)24
3cos(
log )(21x x f -=π
的单调增区间为 A.⎪⎭⎫⎢⎣
⎡++
85,83ππππk k B.⎪⎭⎫⎢⎣
⎡++83,8ππππk k C.⎪⎭⎫⎢⎣
⎡+
-
83,8
πππ
πk k D. ⎪⎭
⎫⎢⎣⎡
++87,85ππππk k
12.已知,32
tan =-β
α,则βα2sin 2sin ⋅=u 的最大值等于
A.
257 B.258 C. 2516 D.16
7
二.填空题(每小题4分,共16分) 13.函数⎪⎭
⎫
⎝⎛-=x y 26sin 2π,[]()π,0∈x 为增区间是。 14. 函数)0(),11ln(>-+=x x y 的反函数=-)(1
x f 。
15.已知正项数列{}n a ,12,111++==+n n n a a a a ,(+∈N n ),则数列{}n a 的前n 项和
=n S 。
16.函数x
x
x y cos cos 3cos -=的值域为。