1:(10 + 3) × 2 - 22:((10 + 3) × 2) - 23:(2 × (10 + 3)) - 24:2 × (10 + 3) - 25:(2 × (3 + 10)) - 26:2 × (3 + 10) - 27:(3 + 10) × 2 - 28:((3 + 10) × 2) - 2