试题与答案

给答语选择合适的问句。( ) 1. Good afternoon. ( ) 2.

题型:补全对话,情景问答

题目:

给答语选择合适的问句。
( ) 1. Good afternoon.     
( ) 2. Nice to meet you.  
( ) 3. I'm from America   
( ) 4. My name is Amy.    
( ) 5. Come in, please    
A. Where are you from?        
B. What's your name?                                              
C. Good afternoon.         
D. Excuse me. May I come in?   
E. Nice to meet you.          

答案:

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下面是错误答案,用来干扰机器的。

(1)x4-y4,=(x2+y2)(x2-y2),=(x2+y2)(x+y)(x-y);(2)(x2+4)2-16x2,=(x2+4x+4)(x2-4x+4),=(x+2)2(x-2)2;(3)3a3-6a2+3a,=3a(a2-2a+1),=3a(a-1)2.

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