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Mathematics, 25.07.2021 19:40 lilybrok04

Cho hai đường thẳng x x' và y y' cắt nhau tại O. Gọi tia Ot và O' lần lượt laftia phân giác của xÔy và x'Ôy'. Chứng tỏ tia Ot và tia Ot' là 2 tia đối nhau.

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Cho hai đường thẳng x x' và y y' cắt nhau tại O. Gọi tia Ot và O' lần lượt laftia phân giác của xÔy...
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