prep pack2 两道数学求问。。。

amandahzy · 发表于 2017-11-23 21:55:32

1. last year, sales at company x were 10% greater in February than in January, 15% less in March than in February, 20% greater in April than in March, 10% less in May than in April, and 5% greater in June than in May. In which month were sales closest to the sales in January?
A February
B.March
C April
D May
E June
答案是D。。。我用设X的方式把每个月表示出来之后，结果和答案不一样。。。求问大神们有没有更好的解决方法？

2.Is the positive integer x divisible by each integer from 2 through 6?
(1) x=10m, where m is a positive integer divisible by each integer from 2 through 5.
(2)10X=n, where n is a positive integer divisible by each integer from 2 through 9.

答案是A。。。想问条件二是怎么判断的？？

lamaqin · 发表于 2017-11-24 21:25:41

第一题的话搞清到底哪个量多哪个量少千万不要搞差了算着算着就可以自然算到MAY的差距是最小的

lamaqin · 发表于 2017-11-24 21:32:40

第二题 10n可以被2~9整除
可以用5作为比喻 10n可以被5整除不代表n可以被5整除
有可能可以有可能不可以所以不成立

prep pack2 两道数学求问。。。

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