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	Các bình luận về: Đề: Trong không gian với hệ tọa độ Oxyz, cho hai mặt phẳng \(\left( P \right):2x + ay + 3z &#8211; 5 = 0\) và \(\left( Q \right):4x &#8211; y &#8211; \left( {a + 4} \right)z + 1 = 0\). Tìm a để (P) và (Q) vuông góc với nhau.	</title>
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