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mlovem1942001
2 năm trước
B1)Cho hình thang ABCD (AB // CD) AB< CD,AD=BC=AB. Tính số đo các góc của hình thang B2) Cho tứ giác ABCD, AB=BC và AC là tia phân giác của góc A. CM rằng : Tứ giác ABCD là hình hang
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