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中3数学(1次関数の応用)垂線の傾き

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Uploaded by on Mar 7, 2009

中学数学の知っておくと便利な、
ごくごく一般的な、
ちょっとした裏技(?)を、
少しずつ紹介していきます。
http://blogs.yahoo.co.jp/mariopapa2397
も、よろしく。

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