Question

有A、B、C、D、E五個(gè)小足球隊(duì)參加足球比賽，到現(xiàn)在為止，A隊(duì)賽了4場，B隊(duì)賽了3場，C隊(duì)賽了2場，D隊(duì)賽了1場．那么E隊(duì)賽了

 

場．

Answer 1

分析：五個(gè)小足球隊(duì)參加足球比賽，每個(gè)隊(duì)都要與其它四個(gè)隊(duì)各賽一場，即每個(gè)隊(duì)共賽4場，A隊(duì)已賽了4場，則A隊(duì)已與B、C、D、E四個(gè)隊(duì)各賽了場；由于D隊(duì)只賽了1場，則D隊(duì)這場是與A隊(duì)賽的，與其它除還沒比賽；B隊(duì)賽了三場，則B隊(duì)是與A、C、E 三隊(duì)賽的；C隊(duì)共賽兩場，則是與A B兩隊(duì)賽的；所以此時(shí) E隊(duì)已賽兩場，是分別與A B兩隊(duì)賽的．

解答：解：由題意可知，每個(gè)隊(duì)需賽4場，
A隊(duì)已賽了4場，則A隊(duì)已與B C D E四個(gè)隊(duì)各賽了場；
由于D隊(duì)只賽了場，則D隊(duì)這場是與A隊(duì)賽的，；
B隊(duì)賽了三場，則B隊(duì)是與A C E 三隊(duì)賽的；
C隊(duì)共賽兩場，則是與A B兩隊(duì)賽的；
所以此時(shí) E隊(duì)已賽兩場，
是分別與A B兩隊(duì)賽的．
故答案為：2．

點(diǎn)評：此題主要考查了推理與論證，根據(jù)每隊(duì)需賽的總場數(shù)及每隊(duì)已賽的場數(shù)進(jìn)行分析是完成本題的關(guān)鍵．