题目

甲乙两人承包铺地砖任务，若甲单独做需20小时完成，乙单独做需要12小时完成．甲乙二人合做6小时后，乙有事离开，剩下的由甲单独完成．问甲总共做了多少小时？设甲共计做了x小时，可列方程为 ． 答案：+=1．【解答】解：设甲共计做了x小时，根据题意得 +=1． I have some tickets for the basketball match. I wonder ______.A．where you buy the ticketsB．why you like to go thereC．if you’d like to come alongD．when you watch the match