• 2022-05-31
    已知两条直线[img=194x23]1803782d8c78d97.png[/img],其中[img=46x20]1803782d95ba2c4.png[/img],当这两条直线的夹角在[img=56x39]1803782d9f3529b.png[/img]内变动时,a的取值范围是()
    A: [img=42x29]1803782da78bb1a.png[/img]
    B: [img=78x48]1803782db1599da.png[/img]
    C: [img=139x48]1803782dba4d713.png[/img]
    D: [img=58x30]1803782dc37e45d.png[/img]
  • 举一反三