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	Các bình luận về: Đề: Trong không gian với hệ trục tọa độ Oxyz, cho hai mặt phẳng \(\left( \alpha  \right):x + y &#8211; z + 1 = 0\) và \(\left( \beta  \right): &#8211; 2{\rm{x}} + my + 2{\rm{z}} &#8211; 2 = 0.\) Tìm m để \(\left( \alpha  \right)\) song song với \(\left( \beta  \right).\)	</title>
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