Question

11．在某屆籃球賽上，甲、乙、丙、丁、戊5隊(duì)被分在同一小組，每2隊(duì)之間要賽一場(chǎng)．甲隊(duì)已經(jīng)賽了4場(chǎng)，乙隊(duì)賽了3場(chǎng)，丙隊(duì)賽了2場(chǎng)，丁隊(duì)賽了1場(chǎng)．戊隊(duì)賽了幾場(chǎng)？分別和哪幾個(gè)隊(duì)賽的？

Answer 1

分析 首先根據(jù)甲、乙、丙、丁、戊5個(gè)隊(duì)兩兩之間比賽，那么每個(gè)隊(duì)都要和其余的4個(gè)隊(duì)比賽，每隊(duì)賽4場(chǎng)，然后根據(jù)甲、乙、丙、丁四隊(duì)比賽的場(chǎng)次進(jìn)行推算，判斷出戊隊(duì)賽了幾場(chǎng)，分別和哪幾個(gè)隊(duì)賽的即可．

解答 解：因?yàn)橐还灿屑�、乙、丙、丁、�?隊(duì)，
所以每隊(duì)最多賽4場(chǎng)．
（1）因?yàn)榧钻?duì)已經(jīng)賽了4場(chǎng)，
所以甲隊(duì)和其余的四隊(duì)都賽了一場(chǎng)，包括丙隊(duì)和戊隊(duì)．
（2）丁隊(duì)賽了1場(chǎng)，說(shuō)明丁隊(duì)只和甲隊(duì)進(jìn)行了比賽，沒(méi)有和其它隊(duì)比賽．
（3）因?yàn)橐谊?duì)賽了3場(chǎng)，乙隊(duì)沒(méi)有和丁隊(duì)比賽，
所以乙隊(duì)和其余的三隊(duì)進(jìn)行了比賽，包括丙隊(duì)和戊隊(duì)；
（4）丙隊(duì)賽了2場(chǎng)，是和甲隊(duì)、乙隊(duì)進(jìn)行的比賽，沒(méi)有和戊隊(duì)比賽．
綜上，可得
戊隊(duì)賽了2場(chǎng)，分別和甲隊(duì)、乙隊(duì)賽的．
答：戊隊(duì)賽了2場(chǎng)，分別和甲隊(duì)、乙隊(duì)賽的．

點(diǎn)評(píng) 此題主要考查了邏輯推理問(wèn)題，要熟練掌握，解答此題的關(guān)鍵是判斷出每隊(duì)最多賽4場(chǎng)，進(jìn)而判斷出甲隊(duì)和其余的四隊(duì)都賽了一場(chǎng)．