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loga2099
2 năm trước
cho ∠xOy. trên Ox lấy điểm A, trên Oy lấy điểm B sao cho OA= OB. gọi C là 1 điểm trên tia phân giác Oz của góc xOy. chứng minh rằng: a) AC= AB và ∠xAC = ∠yBC b) OC ⊥ AB * ko cần vẽ hình
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