ky2y的知识精选

要使(y2-ky+2y)(-y)的展开式中不含y2项,则k的值为(  )A.-2              B...
问题详情:要使(y2-ky+2y)(-y)的展开式中不含y2项,则k的值为()A.-2              B.0               C.2               D.3【回答】C【解析】先用整式乘法将式子展开,再根据展开式中...
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