题:证明
C(3,0)C(6,4)+C(3,1)C(6,3)+C(3,2)C(6,2)+C(3,3)C(6,1)=C(9,4)
要求,不许展开。
题:证明
C(3,0)C(6,4)+C(3,1)C(6,3)+C(3,2)C(6,2)+C(3,3)C(6,1)=C(9,4)
要求,不许展开。
                    •                    
                    相比较而言, solving math problems is
                     -392- 
                    ♂                    
                        
                    
                                                            
                        
                    
                                        
                    
                    
                                        
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                        12/29/2012 postreply
                                                10:49:15
                    
                    
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                    是不是输了棋受打击了?好多成年人也会这样的
                     -说的好- 
                    ♀                    
                        
                    
                                                            
                        
                    
                                        
                    
                    
                                        
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                        12/29/2012 postreply
                                                10:56:34
                    
                    
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                    不是。是我的错
                     -392- 
                    ♂                    
                        
                    
                                                            
                        
                    
                                        
                    
                    
                                        
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                        12/29/2012 postreply
                                                12:17:30
                    
                    
                    •                    
                    那是因为你的水平比儿子差?TT师兄好像pushed很成功嘛。
                     -sweetptt- 
                    ♂                    
                        
                    
                                                            
                        
                    
                                        
                    
                    
                                        
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                        12/29/2012 postreply
                                                12:55:58
                    
                    
                    •                    
                    放羊式教育有时候也是一种很好的教育方式,看是哪种孩子。:)
                     -瞎问瞎说- 
                    ♂                    
                        
                    
                                                            
                        
                    
                                        
                    
                    
                                        
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                        12/29/2012 postreply
                                                11:03:06
                    
                    
                    •                    
                    俺就是被放羊长大的:-(
                     -小心翼翼的小地主- 
                    ♀                    
                        
                    
                                                            
                        
                    
                                        
                    
                    
                                        
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                        12/29/2012 postreply
                                                11:52:08
                    
                    
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                    Cannot read any algebraic book or combinatorics book either
                     -naive2- 
                    ♀                    
                        
                    
                                                            
                    
                    
                                        
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                        12/29/2012 postreply
                                                14:20:08
                    
                    
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