Cho tam giác đều ABC. Với mỗi điểm tuỳ ý gọi M1 là điểm đối xứng với M qua đường thẳng AB,M2 là điểm đối xứng với M1 qua BCM3 là điểm đối xứng với M2 qua CA. Tĩm quỹ tích trung điểm của đoạn MM3

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