①   ②如果;则与条件相同 (7)的展开式的常数项是(     )

   如果;则条件相同

7的展开式的常数项是(    

                                            

答案

第一个因式取,第二个因式取得:

第一个因式取,第二个因式取得:  展开式的常数项是

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