1．2^x+2^x+2^x+2^x=2^n, 问用n表示x 2．如果说整数n是Perfect integer 是指n的所有factor（包括1和n本身）的sum等于2n，问perfect integer 28的所有的factor的倒数之和等于多少？ 3．有60个人接受一个关于雪糕口味的调查，雪糕的口味有三种：草莓味、云呢拿和巧克力。调查的60个人没有任何人并排其中的两种或两种以上的口味。其中有n(n已知)个人把云呢拿放在最后一位，a/b（已知）的人把云呢拿放在巧克力后面，x/y的人把云呢拿放在草莓后面。问有多少人把云呢拿放在第一位。 4．有一张圆形的桌子，桌子的周长（或面积。。忘了）为a（已知），要在桌子上放一个rectangle的台布。问rectangle的可能的最大周长（或面积）能使台布覆盖桌子并且有10 inch下垂（下划线部分不是很肯定是不是这个意思。。等其他NN补充吧）。 5． Six seating tables around a big table. A B C D E F each sit on a table. A must sit opposite to the window. B must beside A. How many seating arrangement? 2*P(4,4)=48. 可是没有交代对着窗的table有几个。我就假设只有一个了。
作文： AA:新黄金80第32题 The following appeared in the editorial section of a West Cambria newspaper.“A recent review of the West Cambria volunteer ambulance service revealed a longer average response time to accidents than was reported by a commercial ambulance squad located in East Cambria. In order to provide better patient care for accident victims and to raise revenue for our town by collecting service fees for ambulance use, we should disband our volunteer service and hire a commercial ambulance service.” AI：说试图延长人类的平均寿命的做法是错误的，因为会加重资源的负担，并且。。（还有一个原因，忘了。。好像也是说会加重某种负担的） | 
