A1*q=a2 √2q=a1+(2-√2)/2=√2+1-√2/2=1+√2/2
q=1/√2+1/2=√2/2+1
((а+б)^2-(а-б)^2)*(1/а+1/б) =<span>((a^2 +2ab +b^2) - (a^2 - 2ab +b^2))*(1\a + 1\b)=
</span>(a^2 +2ab +b^2 - a^2 + 2ab - b^2)*(1\a + 1\b)=
4ab * *(1\a + 1\b) =4ab\a + 4ab\b=
4b+4a
если <u /> то