函数f（x）=x3-15x2-33x+6的单调减区间为______．_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题解答题

函数f（x）=x³-15x²-33x+6的单调减区间为______．

答案

对函数f（x）=x³-15x²-33x+6求导，得f′（x）=3x²-30x-33，

令f′（x）＜0，即3x²-30x-33＜0，解得，-1＜＜11

∴函数f（x）=x³-15x²-33x+6的单调减区间为（-1，11）

故答案为（-1，11）

完形填空

Han Mei is a nice girl. She 1 from Yunnan. 2 this picture of her family. There are 3 people in her family. 4 can see her father, her mother and her brother. Han Mei is behind (在后面) her mother, 5
we can see her. Han Mei has a 6 . It's a nice cat. Its 7 i

s Mimi. Can you see 8 cat? Oh, 9 in
Han Mei's arms. Han Mei has a 10 25 family. She loves her family very much .

( )1. A. comes
( )2. A. Look
( )3. A. three
( )4. A. We
( )5. A. but
( )6. A. dog
( )7. A. age
( )8. A. a
( )9. A. it's
( )10. A. small

B. come
B. Look at
B. four
B. They
B. and
B. bird
B. name
B. an
B. he's
B. big

C. are
C. See
C. five
C. She
C. or
C. pet
C. friend
C. the
C. she's
C. happy

单项选择题

尿毒症最具有特征性的症状是：

A、厌食、呕吐

B、贫血、出血

C、心包炎

D、氨臭

E、代谢性酸中毒