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	Các bình luận về: Đề: Trong không gian với hệ tọa độ Oxyz, cho 3 điểm A(2; 1; 4), B(–2; 2; –6), C(6; 0; –1). Tính tích vô hướng \(\overrightarrow {AB} .\overrightarrow {AC}\).	</title>
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