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①範囲の左端でとるとき 
②範囲の右端でとるとき
③範囲の両端でとるとき(軸が範囲の真ん中のとき)
で場合分けだとおもいます!

図が汚くてすみません🙇‍♀️

mayu

ありがとうございます♪

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