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たとえば、面積５の正方形の１辺はルート５です。２乗するとａになる数を、ルートａといいます。ルートの計算は一見ややこしいのですが、ルートの意味を知れば大丈夫。ルートは、これから方程式や関数を学んでいくうえでとても大切です。パパっとマスターしちゃいましょう。出演：さくら、三浦　玄

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