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2022-11-14 12:36:42
x x' y y' O ) 1 2 3 4
2022-11-14 12:32:49
Cho đường thẳng xx' và một điểm O nằm trên đường thẳng xx'. Trên nửa mặt phẳng bờ xx', vẽ tia OM sao cho xOM =140% . Trên nửa mặt phẳng bờ xx' không chứa tia OM vẽ tia ON sao cho xON = 40%. chứng minh xON và x' OM là hai góc đối đỉnh.
∘
2022-11-14 11:53:46
Nêu khái niệm về góc bẹt