3.1n5
Let n represent the hundredths digit in the number shown above. If the number is rounded to the nearest tenth, which of the following could be the tenths digit in the rounded number?
0
2
4
5
6
二楼放解析,其实这道题无论是解析还是题干都看不懂
另外求翻译这句:
If the number is rounded to the nearest tenth作者: 小硕鼠 时间: 2013-8-28 17:39:37
Rounding 3.1n5 to the nearest hundredth requires that we first consider the digit in the thousandths place, a 5. This means that we must round the n in the hundredths place up to n + 1. For most values of n, the tenths digit would be unaffected by the rounding.The number 3.1n5 presently has a 1 in the tenths place, and if n is anything but 9, the tenths place will remain a 1 even after the rounding. However, 1 is not an answer choice.If n were 9, rounding to the nearest hundredth would require rounding up both the hundredths and the tenths digits, resulting in 3.20 or 3.2. The number 2 could therefore be in the tenths place of the rounded figure.The correct answer is B.作者: mailliw1 时间: 2013-8-28 17:41:40