共50条信息
已知空间四边形\(ABCD\),满足\(\left| \overrightarrow{AB}\right|=3,\left| \overrightarrow{BC}\right|=7,\left| \overrightarrow{CD}\right|=11,\left| \overrightarrow{DA}\right|=9 \)则\(\overrightarrow{AC}\cdot \overrightarrow{BD}\)的值为\((\) \()\)
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