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设的二项式展开式中各项系数之和为.其二项式系数之和为.若.则其二项式展开式中项的系数为(
设的二项式展开式中各项系数之和为.其二项式系数之和为.若.则其二项式展开式中项的系数为(
发布时间:2021-02-20 21:57:47
设的二项式展开式中各项系数之和为,其二项式系数之和为,若,则其二项式展开式中项的系数为( )
A. B.1 C.2 D.3
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答案:
B
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设的二项式展开式中各项系数之和为t.其二项式系数之和为h.若h+t=272.则其二项式展开
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