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Tnnphuong11a1
2 năm trước
giúp mình vẽ hình luôn nhé hứa vote 5sao Cho tam giác ABC cân tại A có góc A= 40 độ. trên tia đối của tia AB lấy điểm D. trên tia đối của tia ac lấy điểm E sao cho AD=AE. Chứng minh DE//BC, tam giác BAE= tam giác CAD, BE=DC.
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