Question

某市中学生排球赛中,按胜一场得2分,平一场得1分,负一场得0分计算,市第四中学排球队参加了8场比赛保持

Answer 1

x= 赢 y= 平

x + y = 8 [A]

2x + y = 13 [B]

2{(x+y) =8 } = [A] x 2 = [C]

2x +2y = 16 [C]

[C] - [B]

y= 3 | x= 5

赢5场!