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hoaitram2108
2 năm trước
Cho góc xoy khác góc bẹt, Ot là tia phân giác của góc đó. Qua điểm H thuộc tia Ot, kẻ đường vuông góc với Ot, nó cắt Ox tại A , Oy tại B a)Chứng minh rằng Oa =Ob b) Lấy điểm C thuộc tia Ot, chứng minh rằng CA =CB
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