注æï¼|PA|=2|PB|ä¸PA=2*PBæä¹æ¯ä¸åçï¼åè
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På¨çº¿æ®µABä¸ã 设P(x,y)ï¼åPA=(3-x,-4-y),2*PB=2*(-1-x,2-y)=(-2-2x,4-2y),2*BP=(2+2x,2y-4) 1.PA=2*PB ==> 3-x=-2-2x,-4-y=4-2y ==> x=-5,y=8 2.PA=2*BP ==> 3-x=2+2x,-4-y=2y-4 ==> x=1/3,y=0 â´ç¹Pçåæ æ¯ï¼(-5,8),(1/3,0).
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