请教高人指点

厚厚的黄色那本。

第一题是：On a recent trip,Cindy drove her car 290 miles,rounded to the nearest 10 miles,and used 12 gallons of gasoline,rounded to the nearest gallon.The actual number of miles per gallon that Cindy's car got on this trip must have been between.

答案是:295/12.5 and 284/11.4。

我觉得不对啊，这个不符合四舍五入的规律嘛。难道美国人的四舍五入法跟中国人的不一样？？？？而且5个选项里都是这样的，搞得我一头雾水。

第二题：A bar over a sequence of digits in a decimal indicates that the sequence repeats indifinitely.What is the value of (10⁴-10²)(0.0012)?(12上面有根横线）

请牛牛们帮我解释一下这道题目的意思。谢谢。

增加两题，都是OG里的。

In a certain game,a large container is filled with red,yellow.green,and blue beads worth,respectively,7,5,3 and 2 points each.A number of beads are then removed from the container.If the product of the point values of the removed beads is 147,000,how many red beads were removed?

If the integer n has exactly three positive divisors,including 1 and n, how many positive divisrs does n^2 have?

第一题答案不对吧？

miles是rounded to the nearest 10 miles，所以285<=m<295，gasoline是rounded to the nearest gallon，所以11.5<=g<12.5

所以285/12.5<(m/g)<295/11.5

第二题是说无限循环小数，把备选项带进去算，看哪个分数的值是0.1212……就行了

第三题，14700=7*7*3*2*2*5*5，所以移走了两颗红色的

第四题，n除了n和1以外只有一个其他的divisor，假设是a，所以n应该是a的平方，n^2=a^4，divisor有1，a,a^2,a^3,n,一共5个

第一题答案抄错了，不过也不是你给的那个，OG里的答案是：284/12.5 and 295/11.4   

这个答案令我很纠结，这是四舍五入么。。。