有關ycos150的精選大全

直線l:xsin30°+ycos150°+1=0的斜率是(  )A.                     ...
問題詳情:直線l:xsin30°+ycos150°+1=0的斜率是()A.                                B.C.-                              D.- 【回答】A 知識點:直線與方...
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