数学Aの和事象と積事象の使い分けがよく分かりませんめっちゃ分かりやすく説明お願いします🙇♀️🙇♀️
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![基本例題の[2]についてです。ここの条件ですが、
a/3<=1<=4a/3とありますが4a... - 1](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1810404/thumb_l_webp_70236300-B387-4A8D-A246-76C58E626EEE.webp?Expires=1787721066&Signature=aleJ5WrGyzujmMyvW6y0LDYM73McBymt8-Mum7QqxTwllkg~CErgu5TPKikUeD0YqLjWYka38tiMO03CiJhvbuHp7JWzfNTSgwQM7IRFLc3Fjv2f6ASMylEtEQ82nCr8B3oNT8jPw89SYGFeE6L1KiKz4dGiRPFoqJPGzEBRYs7KIAWFRRayo~bxq8OWmoiDZGbjUvB6cM-p2UWLegg9AsPk-xA7rC~kFUSMM-MV450Gn-1~x1UozquNf35BLAPZkHD4wqSJ3cKknCARiGlsxHjRYXdDRoVS4AwMFHJ27GUUkV7OJHTby1SMDYC7cVeWFHDVnYAZvuHWxOsABpuiFg__&Key-Pair-Id=K2W722D70GJS8W&Expires=1787721066&Signature=arH~jh18QkVte0s5WSYZi96W5Lef7Sosk0IkLW4SAu2VkqXHYWpqvhVxnx0qTvIpOaikyqN~jc~kLrOmVHx3UqsvKrj1SWoY0jCwnGR0MCJoe6pXpi0ljvVnjZOo4Fo0RPKaHqL3r3sACsWkmTy3CktwTdo-KIoK-5dqbDev32OSzicyoTg50SQKHvEdtXfrgY1iJNhmus-2xKL~za2WriVVjJFiVqwGTRGaupduz~FpvrbVXvnwyCf5~~l5ZjXz-e01IDJ-Tpw2df4HM-hQMGCUOeUCTv80sBvLM-9zjnksvmjzeRyC7Nco5Zi760ekwKFdMltLzJoRbpxtFVPNWw__&Key-Pair-Id=K2W722D70GJS8W)
