甲、乙、丙、丁四个人比赛乒乓球,每两个人都要赛一场,结果甲胜了丁,并且甲、乙、丙三人胜的场数相同,丁胜了5t0o'z,N)h4r2N7g8|:K4d3U2^:H,Y(w/R8@9_+Q-p场。3E9f3V7O;]9r'C'u:?.R2G1C5c