Cho góc tù xOy. Bên trong góc xOy , vẽ tia Om sao cho góc xOm = 90 độ và vẽ tia On sao cho yOn = 90 độ. a, Chứng minh : góc xOn = góc yOm b, Gọi Ot là tia phân giác của góc xOy Chứng minh : Ot là tia phân giác của mOn

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