a/(a^2-2a+1) - (a-3)/(a^2-4a+3)=
=a/(a-1)(a-1) - (a-3)/(a-1)(a-3)=a/(a-1)(a-1) - 1/(a-1)=
=(a-a+1)/(a-1)^2=1/(a-1)^2
a=(1+√5)
a-1=+√5
1/(a-1)^2=1/5
отв 0,2
