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MaiAnhLuong
2 năm trước
Cho góc xOy , Ox lấy a,Oy lấy b. Sao cho Oa=Ob. Nối ab vẽ tia phân giác Oz cắt ab bởi CM a ,△aOy=△bOy b, Oy ⊥ab c, Oy là đường trung trực của ab
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