PUMaC 2008 · 几何（A 组） · 第 4 题
PUMaC 2008 — Geometry (Division A) — Problem 4
题目详情
- (3 points) How many ordered pairs of real numbers ( x, y ) are there such that x + y = 200 and √ √ 2 2 2 2 ( x − 5) + ( y − 5) + ( x + 5) + ( y + 5) is an integer?
解析
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Original Explanation
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