設　＝（－2，－1），則與　　同方向之單位向量為【　　　　】。

問題詳情

12. 設　＝（－2，－1），則與　　同方向之單位向量為【　　　　】。

參考答案

答案：C
難度：適中0.654949
統計：A(403),B(144),C(2832),D(459),E(0)

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