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19 tháng 11 2017
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P
1
1. S
2.D
3.S
1,n+1, n+3, n+5 là ba số tự̣ nhiên lẻ̉̉̉ liên tiếp tăng dân ( n€N) sai
2, hai tia ox va oy cung nam tren mot duong thi doi nhau sai
3, co mot va chi mot duong di qua 2 diem phan biet đúng