1xn1的精選

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an是(1+x)n+1（nÎN*）的展開式中含x2的項的係數，則                       ...

an是(1+x)n+1（nÎN*）的展開式中含x2的項的係數，則                       ...

2021-11-18
問題詳情：an是(1+x)n+1（nÎN*）的展開式中含x2的項的係數，則                                                                         A．1...