中3数学 正八角形の面積

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Uploaded by on Aug 20, 2010

中学数学で、覚えておくと役に立つ、
ちょっとした表技を紹介しています。

http://blogs.yahoo.co.jp/mariopapa2397
も、よろしく。

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  • ここの解説でわからないところが理解できました!

    ありがとうございます!!

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