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	Các bình luận về: Đề: Trong không gian Oxyz, cho mặt phẳng \(\left( P \right):x &#8211; y + 3 = 0\). Véc-tơ nào sau đây không là vecto pháp tuyến của mặt phẳng (P).	</title>
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	<description>Học toán, Đề thi toán, Sách giáo khoa Toán, trắc nghiệm Toán online</description>
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