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Sagot :

Bonjour,

(0,49 × 10⁵ × 15 × 10⁻⁹) / (2,1 × 10⁻⁸)

= (0,49 × 15 ÷ 2,1) × 10⁵⁺⁽⁻⁹⁾⁻⁽⁻⁸⁾

=           3,5            × 10⁴

(121 × 10⁻⁸ × 64 × (10⁻⁶)⁻⁷) / (88 × 10⁶)

= (121 × 64 ÷ 88) × 10⁻⁸⁺⁽⁻⁶⁾ˣ⁽⁻⁷⁾⁻⁶

=         88             × 10²⁸

=  8,8 × 10²⁹

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