Mathematics
Senior High
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(1)についてです。増減表の±の判断はどうやってやるのでしょうか？xが２つのときはできるのですが、3つのときはどうすればいいのかわかりません…m(._.)m
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(1)についてです。増減表の±の判断はどうやってやるのでしょうか？xが２つのときはできるのですが、3つのときはどうすればいいのかわかりません…m(._.)m
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![(2)[1]の式はなぜこうなるのでしょうか？
解説お願いします🙏🏻 - 1](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1810073/thumb_l_webp_1717B3E3-8A84-49A5-82D1-466207496D96.webp?Expires=1787322326&Signature=Px75rGXyD9SMJOoni0gkJU0cwGLaZqZn7nJKEZMMxyq4oEXz~PEPtriLXScmA1YpUlolIQTP~F4aLg8MLpMjTbsvK9FNxDaiByyHyfrIczzoNuUyCd6ZW1loL1WLT~rND2DPwYRDz4WPio7YgdWKvFtmNDCNH1iMuvwMhaak1EoTgwLTdr--y9tQizI~DjhLSPfhHfdvD-Fk0o-z8bFIEwDdvHsODg2p8yJrwKWsKxJ71uXjaKW5M~cY3VL9R~VkhBIpWLTjVkStL5MCKm7vs6NDtAD~U1bvkzXbTtSe1BP~ekWU3dV-AiTGExRwtakXVGJUFrLbuXgD4ZSWBtdXVg__&Key-Pair-Id=K2W722D70GJS8W&Expires=1787322326&Signature=keNRYQD4xJ1jyOgRp7Y8XZhNfr0WGqjCeR446ECaBb7BgUUbf6F8qLRqq3rVjoNCCbiNVYwIKjO0Vj92IGwixeg7LpgsE5nojupdf46XKz0iNcDjwFerZjFFkhcnsu7ixjWqDDVJEl9ewB7q-ep5tsSQ4-fyyf5GP92c-xNc4gKVXWkl2KJtOYF8El24GhKJA5lrcH4vcOxXqkoHoLbfPFb5Wv3HoupMBQvzcjOKEdXfwkTbJHAMcuPy4A~QPKqOmu53OYs7t2iFph8sspjj50sEHrHrzIsd~~boc9u~KNEG2Rx-VcS4lCXTPYMJRtGWB9Ze2NqeT0QZcLWRKJPzow__&Key-Pair-Id=K2W722D70GJS8W)
あ、右端の数字2じゃなくて3ですね