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hungdichoi22
2 năm trước
Cho hai đường thẳng xx' và yy' cắt nhau tại o. Gọi Oz là tia phân giác của $\widehat{x'Oy'}$ biết $\widehat{xOy}$ bằng $50^0$ . Như vậy $\widehat{xOy}$=.............(độ).
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