- 315 × 10⁻⁷ - 0,0685 × 10⁻³
= - 3,15 x 10² x 10⁻⁷ - 6,85 x 10⁻² x 10⁻³
= - 3,15 x 10⁻⁵ - 6,85 x 10⁻⁵
= - 10 x 10⁻⁵
= - 1,0 x 10⁻⁴
puisque 10ᵃ x 10ᵇ = ᵃ⁺ᵇ
10⁻ⁿ = 1/10ⁿ
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- 315 × 10⁻⁷ - 0,0685 × 10⁻³
= - 3,15 x 10² x 10⁻⁷ - 6,85 x 10⁻² x 10⁻³
= - 3,15 x 10⁻⁵ - 6,85 x 10⁻⁵
= - 10 x 10⁻⁵
= - 1,0 x 10⁻⁴
puisque 10ᵃ x 10ᵇ = ᵃ⁺ᵇ
10⁻ⁿ = 1/10ⁿ