x=1/2 , то 2 x³ = 2 * (1/2)³ = 2 * (1/8) = 2/8 = 1/4

x = - 1/3 , то   - 15 x³ = - 15 * (- 1/3)³ = - 15 * (- 1/ 27) = 15/27 = 5/9

2∧13 * 8²/ 4∧7 = 2∧13 * (2³)² / (2²)∧7 = 2∧13 * 2∧6 / 2∧14 = 2∧19 / 2∧14 = 2∧5

3∧8 * 27/ 81² = 3∧8 * 3³/ (3∧4)² = 3∧11 / 3∧8 = 3³