1998 AMC 12 第 3 题
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所有题目均经美国数学协会（MAA）官方合法授权使用。
3.
若 、 和 是满足 的数字，则
If and are digits for which then
答案：D
小提示：
个位相减时必须向十位借位
The units column must borrow from the tens column
大提示：
继续依次处理十位和百位的借位
Continue the borrowing through the tens and hundreds columns
解答：
个位给出 ，所以 。十位中， 必须再借位，而 ，所以 。百位于是给出 。因此 ，正确答案是 D。
The units column gives so In the tens column, must borrow, and giving The hundreds column then gives Therefore so D is correct.
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