!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
<span>((64bв +128b+64):b ) : ((4:b)+4) - упрощаем :</span>
(48*b+16)/(b+1)
(48*-15/16 + 16 )/(-15/16 +1)=-464
1) X² - 3XY = X * ( X - 3Y )
2) X² / ( X * ( X - 3Y )) = X / ( X - 3Y )
--------------------------------
3) X^2 - 9Y^2 = ( X - 3Y )*( X + 3Y )
------------------------------
[ X / ( X - 3Y ) ] * [ (( X - 3Y )*( X + 3Y ) ) / X ] = X + 3Y
ОТВЕТ Х + 3Y