a) (−0.1)2 × (−0.1)4 = (−0.1)2+4 = (−0.1)6 = (−0.1)3×2 = [(−0.1)3]2
Vậy (−0.1)2 × (−0.1)4 = [(−0.1)3]2;
b) (12)8 / (12)2 = (12)8−2 = (12)6 = (12)3+3 = (12)3 x (12)3
Vậy (12)8 / (12)2 = (12)3 × (12)3 ;
c) 98 / 273 = (32)8 / (33)3 = 32×8 / 33×3 = 316 / 39 = 37 = 32+5 = 32 x 35
Vậy 98 / 273 = 32 x 35;
d) (14)7 × 0.25 = (14)7 × 14 = (14)7+1 = (14)8 = (14)2×4 = [(14)2]4
Vậy (14)7 x 0.25 = [(14)2]4.
e) [(−0.7)2]3 = [(0.7)2]3 = (0.7)2×3 = (0.7)3×2 = [(−0.7)3]2
Vậy [(−0.7)2]3 = [(−0.7)3]2.