AMC 8 1987 Problem 19

AMC8 1987 年第 19 题

表达式与运算★★★☆☆
Problem A calculator has a squaring key x2\boxed{x^2} which replaces the current number displayed with its square. For example, if the display is       3\boxed{\ \ \ \ \ \ 3} and the x2\boxed{x^2} key is depressed, then the display becomes       9\boxed{\ \ \ \ \ \ 9}. If the display reads       2\boxed{\ \ \ \ \ \ 2}, how many times must you depress the x2\boxed{x^2} key to produce a displayed number greater than 500?
一个计算器有一个平方键 x2\boxed{x^2}，将当前显示的数替换为其平方。例如，如果显示为 3\boxed3 并按下 x2\boxed{x^2} 键，则显示变为 9\boxed9。如果显示 2\boxed2，需要按多少次 x2\boxed{x^2} 键才能产生一个大于 500 的显示数？
  1. A.4
  2. B.5
  3. C.8
  4. D.9
  5. E.250

正确答案 · Correct Answer

A

解析 · Solution

解析整理中

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