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phanphuc
2 năm trước
Cho tam giác ABC có góc A =80 độ điểm E thuộc cạnh BC . Vẽ điểm M đối xứng với E qua AB, vẽ điểm N đối xứng với E qua AC. a, chứng minh rằng AM =AN b,tính số đo góc MAN
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