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sonmy2k1
2 năm trước
dễ lém, cần trc 6h nha 1. cho tứ giác ABCD có CB=CD, đường chéo BD là tia phân giác của góc ADC. chứng minh ABCD là hình thang 2. cho tam giác ABC. trên tia đối tia AB lấy D sao cho AD=AC. trên tia đối tia AC lấy E sao cho AE=AB. chứng minh BCDE là hình thang 3. cho hình thang ABCD (AB//CD,AD//BC) các tia phân giác của góc A và D cắt nhau tại I, các tia phân giác của góc Bvaf C cắt nhau tại J. a, chứng minh AI⊥DI và CJ⊥BJ b, gọi E là giao điểm của AI và BJ, giả sử CD thuộc cạnh CD. chứng minh: CD=AD+BC
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