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2Rと4Rの直列で6R
2RとRの直列で3R
6Rと3Rの並列で 3Rx6R(3R+6R)=2R
かな?

taro

訂正です
和分の積 割り算「/」 忘れです
3Rx6R/(3R+6R)=2R

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