a+b+c=0 -(a+b)=ca*a/(2a*a+bc)+b*b/(2b*b+ac)+c*c/(2c*c+ab)a^2/(2a*a+bc)=a^2/a^2+b*-(a+b)=a^2/a^2-b^2+a^2-ab=a^2/(a-b)(a-c) 同理b*b/(2b*b+ac)=b^2/2b*b-a(a+b)=b^2/(b-a)(c-b)同理c*c/(2c*c+ab)=c*c/(c-a)(c-...