AMC 8 1989 Problem 18
AMC8 1989 年第 18 题
数列与规律★★★☆☆
Many calculators have a reciprocal key that replaces the current number displayed with its reciprocal. For example, if the display is and the key is depressed, then the display becomes . If is currently displayed, what is the fewest number of times you must depress the key so the display again reads ?
许多计算器有一个倒数键 ，将当前显示的数替换为其倒数。例如，如果显示为 并按下 键，则显示变为 。如果当前显示 ，最少需要按多少次 键才能使显示再次变为 ？
- A.1
- B.2
- C.3
- D.4
- E.5
正确答案 · Correct Answer
B
解析 · Solution
解析整理中
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