标题: prep pack2 两道数学求问。。。 [打印本页] 作者: amandahzy 时间: 2017-11-23 21:55 标题: prep pack2 两道数学求问。。。 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.