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Cho hình hộp ABCD.A'B'C'D'.Biết A(1;-1;1),B(1;0;1),C(2;1;2),D^' (4;5;-5) Một vector
11 days ago
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Cho hình hộp ABCD.A^' B^' C^' D^'.Biết A(1;-1;1),B(1;0;1),C(2;1;2),D^' (4;5;-5)
Một vector v ⃗(a;b;1) khác 0 ⃗ vuông góc với cả hai vector (DD') ⃗ và (D'A') ⃗ .Tính-5a+3b
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