试题:
(1 )3a+2-4a-5;                
(2 ) 2(x2+3)-(5-x2)。
整式的加减 2016-05-17

答案:

我来补答
﹙1)解:原式                   
                                           
(2)  解:原式            
                                              
                                                  
 
 
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