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Sagot :

Réponse :

bonjour

ex 4 une erreur

3×10⁻³ ×10⁶

=3×10⁻³⁺⁶

=3 ×10³

=3000

ex 5

3×10²+5×10³

=300+5000

=5300=

5.3×10³

35×10³+540×10²

= 35 000+54 000

= 89000

=8.9×10⁴

2 ×10⁻²+31 ×10⁻³

=0.02+0.031

=0.051

=5.1 ×10⁻²

57×10⁻⁷-6 ×10⁻⁶

=0.0000057-0.000006

=-0.0000003

=-3 ×10⁻⁷

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