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Mathematics, 23.10.2021 03:10 pickles3233
Bài 11: Cho hình chữ nhật ABCD, hai đường chéo AC cắt BD tại O. Lấy điểm M bất kì trên đoạn CD, MO cắt AB tại N. Từ M, N kẻ đường thẳng song song với AC cắt AD, BC ở E, F. a/ Chứng minh: tứ giác BNDM là hình bình hành. b/ Chứng minh: E và F đối xứng nhau qua O. c/ C/m: 3 đường thẳng AC, MN, EF đồng quy. d/ BD cắt NF tại I. C/m: I là trung điểm NF.
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Bài 11: Cho hình chữ nhật ABCD, hai đường chéo AC cắt BD tại O. Lấy điểm M bất kì trên đoạn CD, MO c...
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