2) a -3b +9b² -a² =(9b² -a² ) -(3b -a) =(3b -a) (3b +a) -(3b -a) = (3b -a) (3b +a -1) .
-----------------------------------------------
1₁) (y)^(3/9) =(y)^(1/3) = ∛y =∛2√3=∛(√2²*3) =∛(√12) =(12)^(1/6) --> вряд ли
1₂) y³/9 =(2√3)³/9 =2³*(√3)³/9 =8√3/3.