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hotruongluong810
2 năm trước
Cho góc AOB bằng 140 độ ,vẽ tia OC là tia phân giác của góc AOB. Vẽ tia OD là tia đối của tia OA. a, Tính DOC b,Vẽ tia OE nằm trong AOB, sao cho AOE bằng 5/7 AOB chứng tỏ OB là tia phân giác của DOE.
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