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nt871113
2 năm trước
cho tam giác ABC vuông tại A. Từ một điểm D bất kì trên cạnh BC kẻ DE ⊥ AC tại E và DF ⊥ AB tại F A) chứng minh rằng tứ giác AEDF là hình chữ nhật B) trên tia đối của tia AB lấy điểm G sao cho AG=À. Gọi H là giao điểm của AE và DG. Chứng minh rằng FH là đường trung tuyến của tam giác FDG AI LÀM ĐẦU TIÊN MÌNH VOTE 5 SAO VÀ CHO TLHN
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