помогите пожалуйста ​

Объяснение:

а

1) 3 * (2/9)² = 3 * 4/81 = 1 * 4/27 = 4/27

2) 4/27 + (2/3)³ = 4/27 + 8/27 = 12/27 = 4/9

б

р = -1/3

-18р³ = -18 * (-1/3)³ = -18 * (-1/27) = -2 * (-1/3) = 2/3