不等号

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【すべての実数とは？】15分で二次不等式が理解できる【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【二次不等式】です。答えが「すべての実数」なんて言われたら、びっくりしてしまいますよね。今回は、すべての実数とはどういうことだろうという疑問にお答えしていきます。その前に、そも...

連立不等式の解き方と解法でミスを防ぐ最強の方法

みなさん。こんにちは。今回は「不等式」とくに【連立不等式】について述べていきます。この分野はセンター試験にも必ず出題されますし、図形問題や文章題との親和性も高いので、応用問題も多岐に渡ります。不等式は、これまで等式(方程式)で扱ってきた...

数と式数学IA

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