【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? ...
【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...
【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( )
【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...
【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 ...