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ly1981
2 năm trước
Cho hình bình hành ABCD.Trên tia đối của tia CD lấy điểm E sao cho CD = CE. Gọi O là giao điểm của AC và BD, có M là trung điểm của BC. a/ Chứng minh : Tứ giác ECBA là hình bình hành b/ Chứng minh : ba điểm M,A,E thẳng hàng nha c/ Chứng minh : OM // AB vàOM=1/4DE HUhu mk cần lắm
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