3.正数a b c 、、满足235log log log 0a b c ==->,则( ) A. a b c << B. a c b << C. c a b << D. c b a <<
4.已知01,,,log b a
b a b p a q b r a <<<===,则,,p q r 的大小关系是
A. p q r <<
B. p r q <<
C. r p q <<
D. q p r <<
5.已知0.5log 5m =, 35.1n -=, 0.3
5.1p =,则实数m , n , p 的大小关系为( ).
A. m n p <<
B. m p n <<
C. n m p <<
D. n p m <<
6.已知2
212
221log ,,log 333a b c ⎛⎫
=== ⎪⎝⎭,则,,a b c 的大小关系是( )
A. a b c >>
B. b c a >>
C. c a b >>
D. c b a >> 7
.已知a =
0.82b =, 52log 2c =,则,,a b c 的大小关系为( )
A. c b a <<
B. c a b <<
C. b a c <<
D. b c a << 8.三个数20.3a =, 2log 0.3b =, 0.32c =之间的大小关系是( ) A. a c b << B. a b c << C. b a c << D. b c a << 9.9.已知2log 3a =, 12
log 3b =, 12
3
c -
=,则
A. c b a >>
B. c a b >>
C. a b c >>
D. a c b >> 10.已知12
52log 2,log 3,4
a b c -===,则 ( )
A. a b c <<
B. a c b <<
C. c a b <<
D. c b a <<
11.已知 1.10.612
2,3,log 3a b c ===,则,,a b c 的大小为( )
A. b c a >>
B. a c b >>
C. b a c >>
D. a b c >>
12.若1022,log 3,log sin
5
a b c π
ππ
===,则( )
A. a b c >>
B. b a c >>
C. c a b >>
D. b c a >> 13.设1
132
113,,ln 23a b c π⎛⎫⎛⎫⎛⎫
===
⎪ ⎪ ⎪⎝⎭⎝⎭⎝⎭
,则( ) A. c a b << B. c b a << C. a b c << D. b a c << 14.若幂函数
的图像过点 1,42⎛⎫
⎪⎝⎭
,则()f x = ( ) A. 16x B. 1x - C. 2x D. 2x -
15.已知()()2log 4f x ax =-在区间()1,3-上是增函数,则a 的取值范围( ) A. (),0-∞ B. (],0-∞ C. ()4,0- D. [
)4,0- 16.函数(
)
2
13
log 32y x x =-+的单调递增区间是( )
A. (),1-∞
B. 3,
2⎛⎫
-∞ ⎪⎝⎭
C. ()2,+∞
D. 3,2⎛⎫+∞ ⎪⎝⎭
17.函数()()
2
13
log 4f x x x =-的单调递增区间为
A. (),2-∞
B. ()2,+∞
C. (),0-∞
D. ()4,+∞
18.已知函数()13
log 1f x x =-, 5sin
6
a f π⎛
⎫
= ⎪⎝
⎭
, (
b f =, ()
2log 2c f π=,
则,,a b c 的大小关系是( )
A. a b c >>
B. b a c >>
C. c b a >>
D. a c b >>
二、填空题
19.若幂函数(
)
22
1
33m m y m m x
--=-+的图象不过原点,则m 是__________.
20.函数()()
2lg 23f x x x =-++的单调递减区间是__________.