b) C/m dk IA^2=AB.AM IB^2=AB.NB=> Cần c/m (AB.AM/(AC.AB) + (AB.NB)/(BC.AB) + IC^2=1<=> AM/AC + NB/BC+IC^2=1<=> AM.BC+NB.AC+IC^2=BC.AC<=> AM(NB+NC) + NB(MA+MC) + IC^2= (BN+NC)(MA+MC) <=> BN.AM + IC^2 = MC.NC<=> BN.AM=MC^2-IC^2<=> BN.AM=IM^2=> ĐPCM
b) C/m dk IA^2=AB.AM IB^2=AB.NB=> Cần c/m (AB.AM/(AC.AB) + (AB.NB)/(BC.AB) + IC^<=> AM/AC + NB/BC+IC^2=1<=> AM.BC+NB.AC+IC^2=BC.AC<=> AM(NB+NC) + NB(MA+MC) + IC^2= (BN+NC)(MA+MC) <=> BN.AM + IC^2 = MC.NC<=> BN.AM=MC^2-IC^2<=> BN.AM=IM^2=> ĐPCM
b) C/m dk IA^2=AB.AM IB^2=AB.NB=> Cần c/m (AB.AM/(AC.AB) + (AB.NB)/(BC.AB) + IC^
2=1<=> AM/AC + NB/BC+IC^2=1<=> AM.BC+NB.AC+IC^2=BC.AC<=> AM(NB+NC) + NB(MA+MC) + IC^2= (BN+NC)(MA+MC) <=> BN.AM + IC^2 = MC.NC<=> BN.AM=MC^2-IC^2<=> BN.AM=IM^2=> ĐPCM