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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=1787731270&Signature=mCKQn67iVYm2ct~CWY39B2Jvdmrp1t~heTTiAJ7rrU-ewRPsFMSJ5qs9xUTHxu-Be5V5BT0XuvoOtX301jaN851O47SBLMcwJ4rt74enYX9RMoH-oOMCLuakFSI~8OXzXwsfk36iCjcPP48FWC2Rlbxdr-HcT0PNg~BBjk8EoUcNXAyO0-sLBGwwaFbGDzOOMLrcBSGOyaOZxcJPl067XnPZNt-t4b~5gHWVNi1RiLTHthALAYEAk34cVEWM4ih-iFY4mOgvvEbl9LV8Kd2KOxDMi2cXP3rVREKAClZylihsmHKvIxPH1jgwcE1mkFnBt3gXFnBc2UuMTMhhynjAnQ__&Key-Pair-Id=K2W722D70GJS8W&Expires=1787731270&Signature=ZeAWfhNYOI4VGzziw5-8GB2pYoEvGlHw-ywDAIGOEZ4m-oOCydHpewbncUL64r8Qw1ivHrGxjin-AF0rNhPxJ3iY3gLI5dw5uqE3dBWif~3P3bn4P1v6QK6xCvlAKbCKnCMLaNlYfWrB4UVpXzGxMqPiNTWqqDZGr~clAkMOcPEjPBnBD3jGbWVkD1z5-mhHHj5Y3MhIyCJ61gjRe6cLs~rhGWo27sfwGFyLdZT-JwOPF0YsfsVPWn5bUi1jafulkr-Lf2vrZaStywI6ubB~698IYL~wSJ382eA3~Ktz0SKqwzYgnPC02MXydpk0VMD08Ze4KAo6DFTQMolfSSgzZw__&Key-Pair-Id=K2W722D70GJS8W)
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途中まで出来てたけど(x二乗－1)がまだ因数分解出来るの気づきませんでした！ありがとうございます！！