Question

甲、乙兩隊(duì)開展足球?qū)?img src='http://thumb.zyjl.cn/pic1/files/down/test/2014/03/22/20/2014032220192287106027.files/image018.gif'>抗賽，規(guī)定每隊(duì)勝一場得3分，平一場得1分，負(fù)一場得0分，甲隊(duì)與乙隊(duì)一共比賽了10場，甲隊(duì)保持了不敗記錄，一共得了22分，甲隊(duì)勝了多少場?平了多少場?(只列方程)

Answer 1

解：若設(shè)甲隊(duì)勝了x場，由于其保持不敗記錄，則其平了(10-x)場，得3x+1·(10-x)=22.

本題也可換一種方式來列方程.設(shè)甲隊(duì)平了y場，則其勝了(10-y)場，因而根據(jù)題意又可列出方程y+3(10-y)=22.