求解Prep上的题目，谢谢

francislaw

List K consists of 12 consecutive integers. If -4 is the least integers in the list K, what is the range of the positive intergers in list K？

francislaw

再加一题：
Before being simplified, the instructions for computing income tax in Country R were to add 2 percent of one’s annual income to the average (arithmetic mean) of 100 units of Country R’s currency and 1% of one’s annual income. Which of the following represents the simplified formula for computing the income tax, in Country R’s currency, for a person in that country whose annual income is I?

请大拿们，给出解析，谢谢！

dxt678

List K consists of 12 consecutive integers. If -4 is the least integers in the list K, what is the range of the positive intergers in list K？

-- by 会员 francislaw (2011/6/30 20:16:35)

因为是连续12个整数，最小数是-4，所以最大数是-4+11=7， 求正数的范围，7-1=6

dxt678

再加一题：
Before being simplified, the instructions for computing income tax in Country R were to add 2 percent of one’s annual income to the average (arithmetic mean) of 100 units of Country R’s currency and 1% of one’s annual income. Which of the following represents the simplified formula for computing the income tax, in Country R’s currency, for a person in that country whose annual income is I?

请大拿们，给出解析，谢谢！

-- by 会员 francislaw (2011/6/30 21:05:39)

设Income=I  注意add X to Y
x=2%*I                Y=(1/2)*(100+1%*I)

X+Y=2%*I+(1/2)*(100+1%*I)  自己再化简

francislaw

谢谢，大牛，

francislaw

看到这段文字，就是一脑袋糨糊，

francislaw

List K consists of 12 consecutive integers. If -4 is the least integers in the list K, what is the range of the positive intergers in list K？

-- by 会员 francislaw (2011/6/30 20:16:35)

不是太明白。
如果直接数数，不是7个么？1，2，3，4，5，6，，7
为啥是6呢？

dxt678

List K consists of 12 consecutive integers. If -4 is the least integers in the list K, what is the range of the positive intergers in list K？

-- by 会员 francislaw (2011/6/30 20:16:35)

不是太明白。
如果直接数数，不是7个么？1，2，3，4，5，6，，7
为啥是6呢？

-- by 会员 francislaw (2011/7/1 10:45:44)

因为求的是范围，范围当然要用最大减最小啊。那如果这题最后求出的数列是 （6，7，8，9）那你说范围是4还是3？

bitsera

额。。。。。

蓝梦红林

感谢楼主！受教了！