判別式

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判別式の公式を使って２次方程式や二次不等式を15分で理解できる【受験に役立つ数学IA】

みなさん、こんにちは。数学ⅠAのコーナーです。今回のテーマは【判別式】です。たかしくんのように、判別式という言葉は聞いたことがあっても、意味は分からない人もいるでしょう。今回は判別式dとはそもそも何かを理解した上で、判別式の公式を説明しつ...

たった15分で実数解の個数が求められるようになる【受験に役立つ数学IA】

みなさん、こんにちは。数学ⅠAのコーナーです。今回のテーマは【実数解の個数】です。たかしくん二次方程式が実数解を持つってどういうこと？そもそも実数ってなに？今回は、たかしくんの実数解の個数に関する悩みを解決していきます。最終的には判別...

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