(-0.3)×(-5)×(-0.4)×(-0.8)×(-1)²

To calculate the expression (-0.3)×(-5)×(-0.4)×(-0.8)×(-1)², we first multiply the numbers together:

(-0.3) × (-5) × (-0.4) × (-0.8) × (-1)² = 0.3 × 5 × 0.4 × 0.8 × 1² = 0.3 × 5 × 0.4 × 0.8 × 1 = 0.3 × 5 × 0.4 × 0.8 = 0.6

Therefore, the result of the expression is 0.6.