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Function: driver
File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Cacher.php
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File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/controllers/ver3/Contents.php
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File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
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File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
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Line: 559
Function: get_footer
File: /volume1/web/PhpstormProjects/www_polymath_co_kr/index.php
Line: 315
Function: require_once
수학동아 - 폴리매스
함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
[창의 퍼즐] 21세기 오일러님의 실수(죄송합니다)
delta
2019.12.03 01:01
조회 675
저번 문제 0을 제외한 모든 실수를 곱하는 문제의 정답은 -1또는 0입니다.
0이 아닌 임의의 실수 x에 대해 1/x 는 유일합니다.
그래서 양수만 따지면 1인데, 음수 -1의 역수는 자기 자신이니 -1을 곱해주면
답은 -1입니다.
1이라고 한 분들은 제가 잘못 드렸네요 저도 1인줄 알아서
그리고 0은 문제만들땐 몰랐는데 오늘보니깐 0도 되네요.
문제: 저 댓글은 왜 틀리고, 0은 왜 되는지 증명하시오.
-
21세기오일러
Lv.11
2019.12.05 07:29
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