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http://picflow.koolearn.com/upload/papers/g02/20121002/201210021609079951619.png的展开式中x3的系数为A,二项式系数为B,则A:B=

发布时间:2021-07-12

A.http://picflow.koolearn.com/upload/papers/g02/20121002/20121002160908103321.png

B.http://picflow.koolearn.com/upload/papers/g02/20121002/20121002160908224410.png

C.http://picflow.koolearn.com/upload/papers/g02/20121002/20121002160908335479.png

D.http://picflow.koolearn.com/upload/papers/g02/20121002/20121002160908522528.png

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