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tuanan1909
2 năm trước
bài 1: cho góc nhọn xOy. Lấy điểm A thuộc tia Ox, lấy điểm b thuộc tia Oy sao cho OA=OB. Qua A kẻ đường thẳng vuông góc với Ox cắt Oy tại M, qua B kẻ đường thẳng vuông góc với Oy cắt Ox tại N. Gọi H là giao điểm của Am và BN, I là trung điểm của MN. C/M/R a,ON=OM và AN=BM b, tia OH là tia phân giác của góc xOy c, 3 điểm O,H,I thẳng hàng
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