有關ky2y的精選大全

要使(y2-ky+2y)(-y)的展開式中不含y2項,則k的值為(  )A.-2              B...
問題詳情:要使(y2-ky+2y)(-y)的展開式中不含y2項,則k的值為()A.-2              B.0               C.2               D.3【回答】C【解析】先用整式乘法將式子展開,再根據展開式中...
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