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(x- http://picflow.koolearn.com/upload/papers/20140823/20140823142945765225.gify) 10的展开式中x 6y 4项的系数是(    ) http://picflow.koolearn.com/upload/papers/20140823/20140823142945781332.jpg http://picflow.koolearn.com/upload/papers/20140823/20140823142945781332.jpg5

发布时间:2021-07-12

A.840

B.-840

C.210

D.-210http://picflow.koolearn.com/upload/papers/20140823/20140823142945781332.jpg

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