2х²-у³ якщо х= -0,2 у=-2

2 {x}^{2} - {y}^{3} = 2 \times ( - 0.2) {}^{2} - ( - 2) {}^{3} = \\ 2 \times 0.04 - ( - 8) = 0.08 + 8 = 8.08