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thuyvb1973
2 năm trước
Cho tam giác ABC cân tại A, có Am là đường trung tuyến. Vẽ tia Ax // BC. Vẽ tia Cy // AM, Ax cắt Cy tại I a/ Chứng minh AM vuông góc BC b/ Chứng minh AC = MI c/ Chứng minh ABMI là hình bình hành Giúp e vs ạ! không cần vẽ hình
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