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已知二项式的展开式中第4项为常数项,则 项的系数为 ( ) A.-19 B.19...

已知二项式6ec8aac122bd4f6e的展开式中第4项为常数项,则

6ec8aac122bd4f6e项的系数为                                (    )

       A.-19                        B.19                          C.20                          D.-20

 

C 【解析】略
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