【判断题】若函数f(x)在(a,b)内单调递增,且在(a,b)内可导,则必有f’(x)>0.
【单选题】若f’(x)<0(a<x≤b),且f(b)>0,则在(a,b)内必有______.
【单选题】患者,男性,27岁,今早不慎被车撞倒,头部受到创伤,意识丧失,20分钟后清醒,自觉头痛、头晕,对受伤当时的情况没有记忆,你认为该患者最有可能发生了()
【单选题】Please read the following paragaraph, and find out How the writer develops the paragraph? The internet has been offering a tremendous assistance to its users in terms of communication. To start with, ...
A.
with comparison and contrast
B.
with a combination of examples, comparison and contrast and cause-and-effect pattern
D.
with cause-and-effect pattern
【判断题】若函数在 f (x) 在 ( a, b ) 内具有二阶导数,且 f’(x)0 , 则曲线 y= f( x ) 在 ( a, b) 内单调减少且是向上凹.
【单选题】若f(x)在x0的某个邻域内可导,且f’(x0)=1/2,则当Δx→0时,在x0处,dy与Δx的关系是( ).
【单选题】男性患者,25岁,头部受伤,意识丧失,25分钟后清醒。对伤前近时事情不能记忆,仍有头痛,未查出神经系统的阳性体征,应诊断为
【单选题】若f(-x)=-f(x)(-∞<x<+∞),且在(-∞,0)内f’(x)>0,f"(x)<0,则f(x)在(0,+∞)内是:
【单选题】若f(x)在(a,b)内满足f’(x)0,则曲线y=f(x)在(a,b)内是().
【单选题】若a,b是方程f(x)=0的两个相异的实根,f(x)在[a,b]上连续,且在(a,b)内可导,则方程f’(x)=0在(a,b)内().