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问题 填空题

若函数f（x）的导函数f′（x）=x2-4x+3，则函数f（x+1）的单调减区间是 ______．

答案

∵f′（x）=x2-4x+3，

∴f（x）=

1
3
x3-2x2+3x+c

∴f（x+1）=

1
3
(x+1)3 -2(x+1)2+3(x+1)+c=
1
3
x3-x2 +1+c

∴f′（x+1）=x2-2x

令f′（x+1）＜0得到0＜x＜2

故答案为（0，2）

填空题
选择正确的单词。
drawing   playing   reading   putting   singing   writing   doing
1. Kim is ___________ a book in the classroom.    
2. What is Jenny doing? She is ___________ a song.     
3. Steven is ___________ ping-pong.      
4. Jenny is ___________ on the paper.     
5. Lily is ___________ a picture.    
6. What are you ___________?     
7. She is ___________ her pen on her desk.
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改错题
短文改错
One day in the restaurant where I worked, I am serving
a  table of four and each person had ordered the different    
kind of fish. Three plate were already on the table when      
the man closest to me pointing to one plate and asked me 
the name of the fish on it. Before I can answer him, he 
continued to ask me the name of the fish on another one               
plate.I was about to answer him while I noticed that the                    
last plate on my tray(托盘)began to fall. They fell noisily                                                    
to the floor seconds late, spreading its contents on the                   
carpet. Everyone stared me and I stood there with a red    
face.                                                                             		1._          
2.             
3.              
4._             
5.___       
6.__            
7.___       
8.___       
9.___      
10.__        
                                              
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