A 1 3 b 2 5 c (- 4 7 July 8, 2019 16 32 64 128 A 1 3 b 2 5 c (- 4 7 are collinear or not A 2 1 3 b 0 3 5 c (- 4 7 2 4 3 5 * a 7 b 2 c 4 d 1 Cho 3 điểm a 1 2 1 b 2 1 3 c (- 4 7 5 A 1 2 3 4 5 6 1 2 3 4 a b c d e f g