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【判断题】
在民间音乐、传统音乐和民族音乐三个概念中,民族音乐是所包含的范围最大的。
A.
正确
B.
错误
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【简答题】对于区间[a,b](a<b),若函数y=f(x)同时满足:①f(x)在[a,b]上是单调函数;②函数y=f(x),x∈[a,b]的值域是[a,b],则称区间[a,b]为函数f(x)的“保值”区间. (1)求函数y=x 2 的所有“保值”区间; (2)函数y=x 2 +m(m≠0)是否存在“保值”区间?若存在,求出m的取值范围;若不存在,说明理由.
【单选题】听力原文:W: Hi, Rob, you know that class you missed yesterday? M: Yes, but I was seriously iii. W: I'm sorry to hear that. You (:an have my notes. M: Thanks. I appreciate that. W: So how are you feeling? ...
A.
The man's illness.
B.
The effect of antibiotics.
C.
The hobby of the woman's mother.
D.
Their class.
【单选题】It ________be the vocabulary that caused you the problem in the exercise because you know a lot of words.                                                  (2013·安徽,34)
A.
may
B.
couldn’t
C.
should
D.
needn’t
【简答题】设函数y=f(x)在(a,b)上的导函数为f′(x),f′(x)在(a,b)上的导函数为f″(x),若在(a,b)上,f″(x)<0恒成立,则称函数f(x)在(a,b)上为“凸函数”.已知 f(x)= 1 12 x 4 - 1 6 m x 3 - 3 2 x 2 . (Ⅰ)若f(x)为区间(-1,3)上的“凸函数”,试确定实数m的值; (Ⅱ)若当实数m满足|m|≤2时,函数f(x)在(a,b)上总...
【简答题】设函数y=f(x)在区间D上的导函数为f′(x),f′(x)在区间D上的导函数为g(x)。若在区间D上,g(x)<0恒成立,则称函数f(x)在区间D上为“凸函数”。已知实数m是常数, , (Ⅰ)若y=f(x)在区间[0,3]上为“凸函数”,求m的取值范围; (Ⅱ)若对满足|m|≤2的任何一个实数m,函数f(x)在区间(a,b)上都为“凸函数”,求b-a的最大值。
【单选题】设函数y=f(x)在(a,b)上的导函数为f′(x),f′(x)在(a,b)上的导函数为f″(x),若在a,b)上,f″(x)<0恒成立,则称函数函数f(x)在(a,b)上为“凸函数”.已知当m≤2时, f(x)= 1 6 x 3 - 1 2 m x 2 +x 在(-1,2)上是“凸函数”.则f(x)在(-1,2)上(  )
A.
既有极大值,也有极小值
B.
既有极大值,也有最小值
C.
有极大值,没有极小值
D.
没有极大值,也没有极小值
【单选题】已知函数f(x)满足:①?x,y∈R,f(x+y)=f(x)+f(y),②?x>0,f(x)>0,则(  )
A.
f(x)是偶函数且在(0,+∞)上单调递减
B.
f(x)是偶函数且在(0,+∞)上单调递增
C.
f(x)是奇函数且单调递减
D.
f(x)是奇函数且单调递增
【简答题】设函数y=f(x)在区间D上的导数为f'(x),f'(x)在区间D上的导数为g(x),若在区间D上,g(x)<0恒成立,则称函数y=f(x)在区间D上为“凸函数”已知实数m是常数, f(x)= x 4 12 - m x 3 6 - 3 x 2 2 (1)若y=f(x)在区间[0,3]上为“凸函数”,求m的取值范围; (2)若对满足|m|≤2的任何一个实数m,函数f(x)在区间(a,b)上都为“凸函...
【单选题】听力原文:W: You know, Brian, it doesn't look like you're vacuumed the living room or cleaned the bathroom. M: No, I haven' t. Ugh. I had the worst day. I am so fired, kook, I promise I'll do it this weeke...
A.
A weekday afternoon.
B.
A weekday evening.
C.
A weekend afternoon.
D.
A weekend evening.
【单选题】听力原文:W: Mac, what are you doing? M: Making the bed, Liz. W: You know what, Mac? Connie's going to get a face lift. M: Oh? W: She even said she'd get the rest done, too! M: The rest? W: Yeah ! Mac, if ...
A.
She is going to receive a plastic surgery.
B.
She is going to lift something on her face.
C.
She is going to make up for the sake of face.
D.
She is probably going to put on some makeup.
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