Question

4．A，B，C，D，E，F(xiàn)六個足球隊(duì)進(jìn)行單循環(huán)比賽，當(dāng)比賽到某一天的時候，統(tǒng)計(jì)出A，B，C，D，E五隊(duì)已經(jīng)比賽了5，4，3，2，1場球，則還沒有與B隊(duì)比賽的球隊(duì)是E隊(duì)．

Answer 1

分析 利用每個隊(duì)分別與其它隊(duì)比賽一場，最多賽5場，A隊(duì)已經(jīng)賽完5場，則每個隊(duì)均與A隊(duì)賽過，進(jìn)而得出還沒有與B隊(duì)比賽的球隊(duì)．

解答 解：由每個隊(duì)分別與其它隊(duì)比賽一場，最多賽5場，A隊(duì)已經(jīng)賽完5場，則每個隊(duì)均與A隊(duì)賽過，
E隊(duì)僅賽一場（即與A隊(duì)賽過），所以E隊(duì)還沒有與B隊(duì)賽過．
故答案為：E隊(duì)．

點(diǎn)評 此題主要考查了推理與論證，得出A，E參賽情況是解題關(guān)鍵．