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若(x-http://picflow.koolearn.com/upload/papers/g02/20110922/20110922154206203883.gif)n的展开式中第3项的二项式系数是15,则展开式中所有项系数之和为

发布时间:2021-07-12

A.http://picflow.koolearn.com/upload/papers/g02/20110922/20110922154206218898.gif

B.http://picflow.koolearn.com/upload/papers/g02/20110922/20110922154206265903.gif

C.http://picflow.koolearn.com/upload/papers/g02/20110922/20110922154206265920.gif

D.http://picflow.koolearn.com/upload/papers/g02/20110922/20110922154206281921.gif

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