å¨ä¸è§å½¢ABCå
[Aï¼x1,y1);Bï¼x2,y2);Cï¼x3,y3)]
设CDï¼AFï¼BEç2ï¼1ç¹åå«ä¸ºO1ï¼O2ï¼O3
å 为D为ABçä¸ç¹
æ以D[ï¼x1+x2)/2,(y1+y2)/2]
æ以åéCO1=2åéO1D
æ以O1[(x1+x2+x2)/3,(y1+y2+y3)/3]
åçå¯è¯O2[(x1+x2+x2)/3,(y1+y2+y3)/3]
O3[(x1+x2+x2)/3,(y1+y2+y3)/3]
æ以O1ï¼O2ï¼O3ä¸ç¹éå
æ以ä¸çº¿äº¤äºä¸ç¹O
æ以ä¸è§å½¢çéå¿åä¸æ¡ä¸çº¿çæ¯ä¸º2:1
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