急啊!sat 数学题求解

问题描述:

急啊!sat 数学题求解
if the decimal representation of 1/k,where 0大于1/k小于1,the tenths digit is 1,the hundredths digit is 3, and at least one other digit is nonzero.What is the tenths digit in the decimal representation of k-1/k?
为什么答案是8?

一个小数,十分位是1,百分位是3,要求的那个式子化简后是1-(1/k)所以,用1减0.13,十分位的数字是8
不知道我讲清楚了没.