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b) Chứng minh rằng đường thẳng MN luôn đi qua một điểm cố định. Chứng minh đường thẳng MP luôn đi qua một điểm cố định. b) Tìm tọa độ điểm D sao cho tứ giác ABDC là hình bình hành. a) Ch[r]
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