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2- (-3mn²)⁵ = (-3)⁵m⁵(n²)⁵ = -243m⁵n¹°
3- (4x²y⁻⁴)³ = 4³(x²)³(y⁻⁴)³ = 64x⁶y⁻¹²
4- (-2a⁻²b³c)⁻³ = (-2)⁻³(a⁻²)⁻³(b³)⁻³(c)⁻³ = (-1/8)a⁶b⁻⁹c⁻³
5- (2,83x10⁵)³ = (2,83)³x(10⁵)³ = 22,67x10¹⁵ = 2,267x10¹⁶