f(x)＝2√x -xの増減と凹凸を求めるとき、 xの定義域は0も含みますか？
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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=1788310023&Signature=d22lRsZ1eA0hBRl7rmtkLLmrM3iZbF7KHPqLUVciMfCkuQaupRjVZzmdEV~ANkBWXU9Z0grKNGH4SljWniepq3L6nIaQTlsjF-~4-pBmQD77ZsDMgpvUdXAUzc4v7A5qqcf9AmSk8Z5l~Kj5A0f7sVrAHIgIyNIxdmvix3Q~~cN0-Of7cfcZCO3l9-cpbeDAZaqBa8mrx47Iv0ZHs~GYyXstBRnF5Ed3tJhOBYvFExAVyj92DqeX-F0A9nsHuXlkE-yRzGI8O8aVA7kGugaBAnOI4WZdTn-gZZIly4kQwCUwg2tAEIG2hpisttYc6jQ7qEa1jVe07klbq-EhXj~Ebw__&Key-Pair-Id=K2W722D70GJS8W&Expires=1788310023&Signature=jjh-GndWXxugvm3dM2~xifuWtx7LVqN8zVSUKEX3mgfBM4gGOc-FzH81t23t3e2CkjZpy56lbnXZv42-PPT20Ssn0hYZ~Hs3Ja5Tn6s3wc7kvRTf6pLI-RABKU0xCGo5MKihNhR5dnn2Eddmmb40chqibVAgXv0yFHaQw~xD~N3M3SgA2XQJTX5d-Z3GzoTcsiroPvKWF~wVzQxnYugA3rkSpSzk8W3nDGh9pd71i5atM3mBEvRw2lW4uRSGtjdZIt--yVf6FWAn6m8xk6ZDMPScOg2m8Xr9tlPh0oJ4fDr0jA5PrGFLR3q9KnyF72syRPcJE8QjTtf6Jx2XkDvJTA__&Key-Pair-Id=K2W722D70GJS8W)
