有關yx2y5的精選大全

.(3x-y)(x+2y)5的展開式中,x4y2的係數為(  )A.110                  ...
問題詳情:.(3x-y)(x+2y)5的展開式中,x4y2的係數為()A.110                      B.120                C.130                D.150【回答】.A解析因為(x+2y)5...
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