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thuongquyet1981
2 năm trước
Cho tam giác ABC, trung tuyến AM. Từ M kẻ đường song song với AB cắt AC ở n. Biết AN=MN,BN cắt AM ở O . CM: a) góc MAN= góc b) tam giác ABC cân ở A c) O là trọng tâm tam giác ABC
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