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phungvan601
2 năm trước
Cho tam giác ABC có hai góc A = 3 góc B = 6 góc C a)tính số đo các góc A góc B góc C b)Gọi M là trung điểm của BC Qua M kẻ MY song song với AC cắt AB tại D và MX song song với AB cắt AC tại E Chứng minh tam giác BMC bằng tam giác MCE
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