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	Các bình luận về: Đề: Cho mặt phẳng \(\left( \alpha \right):3x &#8211; 2y + z + 6 = 0\) và điểm \(A\left( {2, &#8211; 1,0} \right)\). Tìm tọa độ hình chiếu vuông góc H của A lên mặt phẳng \(\left( \alpha \right)\).	</title>
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