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langvinh2001
2 năm trước
Cho tia Ot là tia phân giác của góc nhọn xOy. Trên tia Ox lấy điểm E, trên tia Oy lấy điểm F sao cho OE = OF. Trên tia Ot lấy điểm H sao cho OH OE. a) Chứng minh: HE = HF. b) Tia EH cắt tia Oy tại M, tia FH cắt tia Ox tại N. Chứng minh c) Chứng minh: . d) Gọi K là trung điểm của MN. Chứng minh K thuộc tia Ot?
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