А(3а-4)^2+(3а-4)^3=(3а-4)^2•(а+3а-4)=(3а-4)^2•(4а-4)=4(а-1)•(3а-4)^2
( a^3 + b^3) -ab(a + b) = ( a + b)(a^2 - ab + b^2) - ab( a + b) =
= ( a+ b)( a^2 - ab + b^2 - ab) = ( a + b)(a^2 - 2ab + b^2)
1+3√5+1-3√5/(1-3√5)(1+3√5)=2/1+3√5-3√5+45=2/46=1/23
(2,45+2*2,45*3,55+3,55²)/(4,23²-2*4,23*1,23+1,23²)=
=(2,45+3,55)²/(4,23-1,23)²=6²/3²=36/9=4