烦请小伙伴们帮忙解答如下题目，不胜感激
1. When percent of 5,000 is subtracted from of 5,000, the difference is
错误选项：0 正确选项：495 percent of 5,000= 500
is subtracted from 从后面的这个数减去500
from of 5,000= 500
所以 500-500=0 这样的思路不正确么？
2.Yesterday's closing prices of 2,420 different stocks listed on a certain stock exchange were all different from today's closing prices. The number of stocks that closed at a higher price today than yesterday was 20 percent greater than the number that closed at a lower price. How many of the stocks closed at a higher price today than yesterday?
第一题条件肯定有问题 所以做不出来 应该是1除以10percent of 5000，和第二个1除以10from 5000，所以第一个算出来应该是5，而第二个算出来是500，所以500-5等于495。第二题的话 很绕的题目 我也看了很久 因为数学确实差 The number of stocks that closed at a higher price today than yesterday was 20 percent greater than the number that closed at a lower price.
今天比昨天高的股票数量比今天比昨天底的股票数量多20%
设今天比昨天底的股票数量是x, 那么比昨天高的就是（1+20%）x
两个加起来=2420=x+（1+20%）x
x=1100
所以(1+20%）x=1.2×1100=1320
1.第一个贴体没有贴完整， 后面才注意到，最关键的问题是 没有理解 1/10 percent 这个概念 就是0.1%
2.题目没有看懂
1.Yesterday's closing prices of 2,420 different stocks listed on a certain stock exchange were all different from today's closing prices.
a. Yesterday's closing pracies were different different from today's closing pirces.
b. 2,420 different stocks listed on a certain stock exchange were all 只是今天和昨天的总数
price of 2420 different stocks 其实是2420是 stocks 的数量 而不是 价格
2.The number of stocks that closed at a higher price today than yesterday was 20 percent greater than the number that closed at a lower price.
今天价高的数量-昨天价高的数量=1.2（今天价低的数量-昨天价低的数量）
求的是 今天价高的数量-昨天价高的数量？
设价低的为 X. 则价高的为1.2 X
X+1.2X=2420 ------得到 价高的1.2X= 1320
完全明白---- 谢谢
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发表于 2015-11-8 12:15:36
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