問題詳情
20 已知三向量 a = j − 2k 、 b = i − 2k 和 c = 3i + j + k ， (b + 2c) × a 等於：
(A) − 4i + 14 j + 7k
(B) 4i − 14 j + 7k
(C) 4i − 14 j − 7k
(D) − 4i − 14 j − 7k
(A) − 4i + 14 j + 7k
(B) 4i − 14 j + 7k
(C) 4i − 14 j − 7k
(D) − 4i − 14 j − 7k
參考答案
無參考答案
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