解ï¼è®¾A1ï¼A2ï¼A3ï¼A4,A5åæ åå«ä¸ºï¼x1,y1),(x2,y2),(x3,y3),(x4,y4)(x5,y5)
设Måæ 为(x,y)
ç±MA1+MA2+MA3+MA4+MA5=0 å¾æ¹ç¨
ï¼x1-x)+(x2-x)+(x3-x)+(x4-x)+(x5-x)=0
(y1-y)+(y2-y)+(y3-y)+(y4-y)+(y5-y)=0
è§£å¾ x=ï¼x1+x2+x3+x4+x5)/5
y= (y1+y2+y3+y4+y5)/5
æ以æå¯ä¸çM使çå¼æç«ã
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