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chinguyen2000
2 năm trước
trong 1 cuộc thi đá bóng có 4 đội tham gia và đấu theo thể thức vòng tròn (mỗi đội đấu với đội khác đúng 1 trận). Đội thắng được 3 điểm, hòa được 1 điểm, thua được 0 điểm.Cuối cùng 4 đội nhận được số điểm lần lượt là 5 điểm, 6 điểm, 1 điểm và x điểm. Tìm x
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