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danghoainam.2k1
2 năm trước
5 vote nha Bài 4: (3đ) Trên nửa mặt phẳng bờ chứa tia OX vẽ hai tia Oy và Oz sao cho xOy=30 độ/xOz=60độ a) Tia nào nằm giữa hai tia còn lại? b) Tính số đo yOz c) Tia Oy có phải là tia phân giác của góc xOz không? Vì sao? d) Vẽ tia Ot là tia đối của tia Ox. Gọi Oh là tia phân giác của fOz . Tính số đo tOh và hOz. e) Chứng tỏ rằng Oz là tia phân giác của xOh
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