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Function: driver

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Function: _error_handler

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File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
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Function: get_footer

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Function: _error_handler

File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
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Function: model

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Function: getFloatingMyInfo

File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/controllers/ver3/Contents.php
Line: 559
Function: get_footer

File: /volume1/web/PhpstormProjects/www_polymath_co_kr/index.php
Line: 315
Function: require_once

수학동아 - 폴리매스
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페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

수학동아 2020년 1월호 26쪽 수학뉴스에 <12세 소년의 발견! 간단한 7의 배수 판정법>이 기사에서 일의 자리수를 제외한 수를 a, 일의 자리수를 b라고 하면

a-2b나 a+5b나 같잖아요(7b를 더하니까). ). 근데 저 방법은 매우 오래 전부터 알려져 있던 방법이라고 알고 있거든요? 어떻게 이게 새로운 배수 판정법인지 약간 이해가 안 되네요. 증명도 옛날에 됬는데요.

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