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chauphuoc2020
2 năm trước
Câu 14: Cho tứ diện ABCD. Lấy các điểm M, N, P, Q lần lượt thuộc AB, BC, CD, DA sao cho vec tơ AM = 1/3 vec tơ AB, vec tơ BN =2/3 vec tơ BC, vec tơ AQ=1/2 vec tơ AD, vec tơ DP= k vec tơ DC.Hãy xác định k để M, N, P, Q đồng phẳng. Câu 15: Cho tứ diện đều ABCD có canh bằng a. Khi đó, giá trị vec tơ AB( vec tơ AB - vec tơ CA) băng: Các bạn làm ơn giúp mình câu 14,15 với ạ. giải thích chi tiết hộ mình với. cảm ơn nhiều
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