【上智大】十分条件・必要条件【高校数学Ⅰ・a】～演習～論理と集合＃１７
Synopsis
【上智大】十分条件・必要条件のポイントは！ ・有理数・無理数がらみの命題の真偽は, ± √2 が反例になっていないか疑おう！
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