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  <description>次の多変数関数 f(x) を、変数xで偏微分した結果はどれか。 f(x) = 4x² + 5xy + 10 - y²</description>
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  <published>2021-09-06 15:00:00</published>
  <title>DS検定 基礎数学⑥</title>
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