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b. 2.500.000 = 2,5 × 10⁶
c. 0,98 = 9,8 × 10⁻¹
d. 10.000.000.000.000 = 0,1 × 10¹⁴
2) a. 12 × 2³ = 12 × 8 = 96
b. 7,27 × 10² - 0,5 × 10³ = (7,27 × 100) - (0,5 × 1000) = 727 - 500 = 227
c. (8,32 × 10⁴) : (4 × 10⁻⁶) = (83200) : (4/1000000) = 208/10000 = 0,0208
d. 3,7 × 10³ × 5,2 × 10⁻³ = 3,7 × 5,2
3) (492⁵ - 246⁵) = (2 × 246)⁵ - (1 × 246)⁵
= (2⁵ - 1⁵) × 246⁵
= (32 - 1) × 246⁵
= 31 × 246⁵
4) a. x × y = 24 × 54
= 3 × 2³ × 3³ × 2
= 2⁴ × 3⁴
= (2 × 3)⁴
b. x/y = 24/54
= (3 × 2³) / (3³ × 2)
= 3⁻² × 2²
= 2² / 3²
= (2/3)²