Cho toạ độ (o;i;j) cho ba điểm A(1;1)B(2;3)C(−3;4)
a) tìm toạ D sao cho tứ giác ABCD là hình bình hành
b) tìm tọa độ điểm B' đối xứng B qua A
C) tìm tọa độ F sao cho o là trọng tâm tam giác ABF
D)tìm tọa độ trưcj tâm H của tam giác ABC
E)tìm tọa độ điêmr i của đường tròn ngại tiếp tam giác ABC

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