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tohoai084
2 năm trước
Cho tam giác ABC cân tại A có góc B = 30 độ a.Tính số đo góc A b. Gọi M là trung điểm BC. C/m tam giác ABM = ACM c.Biết AB=15cm, BC=18 cm . Tính AM d. Đường thẳng qua M và // với AC cắt AB tại D. C/m MD=AD=CD
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