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ここでは単に,点の座標を直線の方程式に代入して成立するかどうか調べることを想定しています。
(「ある」の方だけで答は得られますが,「ない」方を消しても解答にたどり着くようになっています。)●直線を答える問題
上の条件を全部満たす直線を選びなさい(次の4個の窓のうちから1つ選んでクリック)
[ヒント]
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●点を答える問題
上の条件を全部満たす点を選びなさい(次の4個の窓のうちから1つ選んでクリック)
[ヒント]
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