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http://picflow.koolearn.com/upload/papers/g02/20110825/201108251124076711143.gif的二项展开式中,x2的系数为

发布时间:2021-07-12

A.http://picflow.koolearn.com/upload/papers/g02/20110825/20110825112407687920.gif    

B.http://picflow.koolearn.com/upload/papers/g02/20110825/20110825112407718900.gif    

C.http://picflow.koolearn.com/upload/papers/g02/20110825/20110825112407734899.gif     

D.http://picflow.koolearn.com/upload/papers/g02/20110825/20110825112407734883.gif

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