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Trong không gian với trục tọa độ Oxyz, cho ba điểm A(-1;-4; 4), B(1; 7; -2); C(1; 4; -2).
3 months ago
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Trong không gian với trục tọa độ Oxyz, cho ba điểm A(-1;-4; 4), B(1; 7; -2); C(1; 4; -2). Mặt phẳng (P): 2x + by + cz + d = 0 đi qua điểm A sao cho B và C cùng phía so với (P). Đặt h₁ = d(B, (P)) và h2 =2d(C, (P)). Khi đó h1 + h2 đạt giá trị lớn nhất. Tính T=b+c+d
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