1) 2^-3 + 6^-1 = 1/2^3 + 1/6 = 1/8 + 1/6 = 3/24 + 4/24 = 7/24
2) -2 × 4^-3 = -2 × 1/4^3 = -2 × 1/64 = -1/32
3) 0.4^0 - (-0.25)^-3 = 1 - (-1/0.25^3) = 1 - (-1/0.015625) = 1 - (-64) = 65
1) 2^-3 + 6^-1 = 1/2^3 + 1/6 = 1/8 + 1/6 = 3/24 + 4/24 = 7/24
2) -2 × 4^-3 = -2 × 1/4^3 = -2 × 1/64 = -1/32
3) 0.4^0 - (-0.25)^-3 = 1 - (-1/0.25^3) = 1 - (-1/0.015625) = 1 - (-64) = 65