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人教A版选修1-2 第2章《推理与证明》单元测试卷(1)(含答案解析)
人教A版选修1-2 第2章《推理与证明》单元测试卷(1)(含答案解析)

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一:选择题

1.设,,(,0),a b c ∈-∞则111

,,a b c b c a

+++( ) A .都不大于2- B .都不小于2-

C .至少有一个不大于2-

D .至少有一个不小于2-

2.函数]2

,0[)44sin(3)(π

π

在+

=x x f 内( ) A .只有最大值 B .只有最小值

C .只有最大值或只有最小值

D .既有最大值又有最小值 3.函数x

y 1=

在点4=x 处的导数是 ( )

A .

81 B .81- C .161 D .16

1- 4.设b a b a b a +=+∈则,62,,22R 的最小值是( )

A .22-

B .3

3

5-

C .-3

D .27-

5.设c b a ,,三数成等比数列,而y x ,分别为b a ,和c b ,的等差中项,则=+y

c

x a ( ) A .1 B .2 C .3 D .不确定

6.计算机中常用的十六进制是逢16进1的计数制,采用数字0

9和字母A

F 共16个计数

符号,这些符号与十进制的数字的对应关系如下表:

例如,用十六进制表示,则( ) A .6E B .72 C .5F D .0B

二、填空题

7.从2

2

2

576543,3432,11=++++=++=中得出的一般性结论是_____________。

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