Люди помогите плиз я то полное дно :-)

1) 216^(1/3) - (64/27)^(1/3) = 6 - 4/3 = 14/3 2) 2*3^(1/3) + 81^(1/3) - (3/8)^(1/3) = 2*3^(1/3) + 3*3^(1/3) - (1/2)*3^(1/3) = 4.5*3^(1/3) 3) a^(2/3) * (6*a^(1/3) - (125a^7)^(1/3)) = 6a - 5a^3 4) тут сумма кубов: = a + 8