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oralie
2 năm trước
Bài 1: Cho đoạn thẳng AB và trung điểm O của đoạn thẳng đó. Trên nửa mặt phẳng bờ AB vẽ tia Ax, trên nửa mặt phẳng còn lại vẽ tia By sao cho Ax//By. Gọi M là một điểm trên Ax, tia MO cắt tia By tại N. Chứng minh: a) MA = NB b) Tam giác OMB bằng tam giác ONA. c) MB // AN.
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