※ 引述《macbook0713 (apple)》之銘言：
: 請問一下，這一題要怎麼理解呢？
: 謝謝
: If the units digit of the three-digit positive integer k is nonzero, what is
: the tens digit of k?
: (1) The tens digit of k + 9 is 3.
: (2) The tens digit of k + 4 is 2.
(1) 個位數 ≠ 0