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三道蓝皮书上的题,晕阿! 请高人指点!!!! 谢谢谢谢啦!!!!!!!! P133.2 A parking garage rents parking spaces for $10 per week or $30 per month. How much does a person save in a year by renting by the month rather than by the week? 答案是$160 我是这样想的: (10*4-30)*12=120 但答案中根本无此选项 P135.16 There were 36000 handback copies of a certain novel sold before the paperback version was issued. From the time the first paperback copy was sold until the last copy of the novel was sold. 9 times as many paperback copies as hardback copies were sold. If a total of 441000 copies of the novel were sold in all, how many paperback copies were sold? 答案是 364500 9h+h=441000 h=44100 P=9h=396900 答案中有此选项，但不是正确答案 P226.29 If y is an integer and y=/x/+x, is y=0? (1)x<0 (2)y<1 我选的A 但是正确答案是D 为什么（2）对呢？？ | 
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发表于 2008-12-2 13:24:00
