[讨论]超简单的换算，就是做不出来！见鬼了！

没错

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

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