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pp两道数学题 救命啊!!!

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楼主
发表于 2008-9-2 21:00:00 | 只看该作者

pp两道数学题 救命啊!!!

1.before being simplified, the instruction of computing income tax in R country, were to add 2% of one’s annual income to the average of 100 units of R’s currency and 1% of one’s annual income which of the following represented the simplificated formula for computing the increase tax in R’s currency for a person in that country whose income is I

key: 50+I/40

2. in the arithmetic sequence t1,t2 ,……tn ,….. t1=23,and tn= t(n-1)-3 for each n>1 what is the value of n-3 for each n>1 what is the value of n

-3 for each n>1 what is the value of n

t(n-1)-3 for each n>1 what is the value of n

key n=10

两道题够不知道怎么算出来的,第一题意思不懂 ,第二题的公式是什么,因为前面题t1,t2 既不是加也不是减,更不是成

沙发
 楼主| 发表于 2008-9-3 23:23:00 | 只看该作者

pp题很重要的 nn们帮帮忙好吗?

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