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※ 引述《mqazz1 (無法顯示)》之銘言: : Andrea has 46 rectangular pieces of paper. : If l, w (measured in centimeters) denote the length and width, respectively, : of each rectangular piece, then for this situation we find that each of l, w : is a positive integer, where 1 <= w <= l <= 90. : From among these 46 rectangles, prove that Andrea can select two, : say R1 and R2, so that R2 completely covers R1 when R2 is placed on top of R1 : http://ezproxy.lib.ncu.edu.tw:8080/~arhui/cexamn/exam/EC02_88_08.pdf : 88中央資工第一題 重新再想過~ 46個矩形 共有92個邊長 座落在 [1,90] 區間 假使45個矩形在最壞情況下 均勻散落在 1~90 間 (1,90)、(2,89)、、(45,46) 仍有一個矩形能完美覆蓋 至少45個的其中一個 有錯,謝謝指正 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 210.240.176.185