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Sagot :

AYUDA

 - 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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