问题
单项选择题
函数f(x)的导函数f'(x)的图像如图3-1所示,则在 (-∞,+∞)内f(x)的单调递增区间是( ).
A.(-∞,-1)
B.(-∞,0)
C.(0,1)
D.(-1,+∞)
答案
参考答案:D
解析:
[分析]: 本题考查的知识点是根据一阶导数f'(x)的图像来确定函数曲线的单调区间. 因为在x轴上方f'(x)>0,而f'(x)>0的区间为f(x)的单调递增区间,所以选D
函数f(x)的导函数f'(x)的图像如图3-1所示,则在 (-∞,+∞)内f(x)的单调递增区间是( ).
A.(-∞,-1)
B.(-∞,0)
C.(0,1)
D.(-1,+∞)
参考答案:D
解析:
[分析]: 本题考查的知识点是根据一阶导数f'(x)的图像来确定函数曲线的单调区间. 因为在x轴上方f'(x)>0,而f'(x)>0的区间为f(x)的单调递增区间,所以选D
选用下列合适的形容词或副词的原级、比较级、最高级完成下列句子。 | |
2. Liu Ying talks _____ than Liu Li. 3. Li Hua is my friend. She's a little_____ than me. 4. Do you look the _____ as Tom? 5. Tom often exercises after class. He is _____ than me. 6. He is not as _____ at sports as his sister. 7. Paul is never _____! He can't stop talking. 8. Mr Wang is a _____ man. He always helps others. |