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nguyenanhtuan261095
2 năm trước
cho 2 tia oz,ot thuộc cùng 1 nửa mặt phẳng bờ xy (O thuộc xy), sao cho góc xoz= 55 độ;góc yot= 70 độ a. tính số đo góc xot b. chứng tỏ oz là tia phân giác của góc xot (không cần vẽ hình đâu ạ)
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