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có thể giúp mình bài này được không ak a. Cho mặt phẳng(P) x- z- 3 = 0 và điểm M(1;1;1). Gọi A thuộc Oz, B là hình chiếu của A trên (P). Biết tam giác MAB cân tại M. Tìm diện tích tam giác MAB b. Cho A (-1;3;-2) ; B(-3;7;-18) và (P): 2x - y +z+1 = 0 . Điểm M(a;b;c) thuộc (P) sao cho mặt phẳng ABM vuông góc với mặt phẳng P và $MA^{2}$ +$MB^{2}$ = 246.Tìm P = a+b+c
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