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1260=7*180即現在是7+2=9邊形.一個多邊形的一個頂點做一條直線,把這個多邊形截掉兩個角,有兩種情况1此直線經過另一頂點則减少了3條邊,新增了一條邊.合計减少兩條邊.原來是9+2=11邊2此直線不經過別的頂點則只减少兩條…
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