In its early history, Chicago had floods frequently, especially in the spring, making the streets so muddy that people, horsesto lower the Chicago River or raise the cityAn engineer named Ellis Chesbrough convinced the city that it had no choice but to build the pipes above ground and then cover them with dirt. This raised the level of the city's streets by as much as 12 feet.The next morning at school,Bob’s teacher asks Bob to make sentences with the words “ you,he and I”.Bob 10.stands(stand) up and says,“I am your基本初等函数(1)
一、选择题(5分/题)
1.[2017·西安联考]已知函数取值范围是( ) A.
【答案】C 【解析】
,解得
,故选C.
2.[2017·岳阳一中]已知函数象不可能是( )
在
是单调函数,则
的图
或
,∴当,∴要使函数在
时,的值域是
,由,则
B.D.
C
.
,
的值域是
,则实数
的
A. B.C.
【答案】B
D.
【解析】由题意可知,选项A中,符合题意;若,则对称轴,且
与x轴的交点为(
都符合题意,故选B.
,0),应交于x轴非负半轴,所以B不符合题意,C,D
In its early history, Chicago had floods frequently, especially in the spring, making the streets so muddy that people, horsesto lower the Chicago River or raise the cityAn engineer named Ellis Chesbrough convinced the city that it had no choice but to build the pipes above ground and then cover them with dirt. This raised the level of the city's streets by as much as 12 feet.The next morning at school,Bob’s teacher asks Bob to make sentences with the words “ you,he and I”.Bob 10.stands(stand) up and says,“I am your3.[2017·天水一中] “数”的( ) A.充分不必要条件 充分也不必要 【答案】A 【解析】函数
在区间
“函数
”是“函数在区间上为增函
B.必要不充分条件 C.充要条件 D.既不
的对称轴为,则函数在
,得
上递增,若函数.所以“
”是
上为增函数,所以
在区间
,
上为增函数”的充分不必要条件,故选A.
,
的图象如图所示,则( )
4.[2017·湖师附中]已知函数
A.【答案】C 【解析】由图象有看图象有所以
,,所以,故
,对于,选C.
,
B.D.
,C
,则( )
.
,所以
最小,对于,
,
,,看图象有
,
,,
B.
C.
D.
5.[2017·榆林二中]已知A.
【答案】A 【解析】由题意得6.[2017·黄石三中]若点
,
,
,
与
,∴.选A.
分别是函数的图象上的点,且线段