Trên đường thẳng xx’ lấy O.Trên nửa mặt phẳng bờ xx’ vẽ tia Oy sao cho xOy =45 độ.Trên nửa mặt phẳng kia vẽ tia Oz sao cho Oz vuông góc vs Ox. a) chứng minh rằng xOy vad x’Oy’ là 2 góc đối đỉnh

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