共50条信息
化简\(( \overrightarrow{AB}- \overrightarrow{CD})-( \overrightarrow{AC}- \overrightarrow{BD}) \)__________\(;\)
如图,在\(\triangle ABC\)中,\(AD⊥AB\),\( \overset{⇀}{BC} = \sqrt{3} \overset{⇀}{BD} \),\(\left| \overset{⇀}{AD}\right| =1\),则\( \overset{⇀}{AC}. \overset{⇀}{AD} =\)
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