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若二项式http://picflow.koolearn.com/upload/papers/g02/20120424/201204241349512651549.gif的展开式的第四项是http://picflow.koolearn.com/upload/papers/g02/20120424/20120424134951315983.gif,而第三项的二项式系数是15,则x的取值为

发布时间:2021-07-12

A.http://picflow.koolearn.com/upload/papers/g02/20120424/20120424134951342959.gif(k∈Z)

B.http://picflow.koolearn.com/upload/papers/g02/20120424/201204241349513701018.gif(k∈Z)

C.http://picflow.koolearn.com/upload/papers/g02/20120424/201204241349513971031.gif(k∈Z)

D.http://picflow.koolearn.com/upload/papers/g02/20120424/201204241349514231038.gif(k∈Z)

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