n条直线两两相交于不同点,图中有n(n-1)/2对对顶角,有2n(n-1)(n-2)对同位角,有n(n-1)(n-2)对同旁内角这个答案是怎么得到的?
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![n条直线两两相交于不同点,图中有n(n-1)/2对对顶角,有2n(n-1)(n-2)对同位角,有n(n-1)(n-2)对同旁内角这个答案是怎么得到的?](/uploads/image/z/8659784-56-4.jpg?t=n%E6%9D%A1%E7%9B%B4%E7%BA%BF%E4%B8%A4%E4%B8%A4%E7%9B%B8%E4%BA%A4%E4%BA%8E%E4%B8%8D%E5%90%8C%E7%82%B9%2C%E5%9B%BE%E4%B8%AD%E6%9C%89n%28n-1%29%2F2%E5%AF%B9%E5%AF%B9%E9%A1%B6%E8%A7%92%2C%E6%9C%892n%28n-1%29%28n-2%29%E5%AF%B9%E5%90%8C%E4%BD%8D%E8%A7%92%2C%E6%9C%89n%28n-1%29%28n-2%29%E5%AF%B9%E5%90%8C%E6%97%81%E5%86%85%E8%A7%92%E8%BF%99%E4%B8%AA%E7%AD%94%E6%A1%88%E6%98%AF%E6%80%8E%E4%B9%88%E5%BE%97%E5%88%B0%E7%9A%84%3F)
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