Réponse :
Salut,
Explications étape par étape
4.5 × 104
= 4.5 × 100 + 4.5 × 4
= 450 + 18
= 168
15 × 1.1
= 15 × 1 + 15 × 0.1
= 15 + 1.5
= 16.5
16 × 9.9
= 16 × 10 - 16 × 0.1
= 160 - 1.6
= 158.4
3.2 × 12 - 3.2 × 2
= 3.2 × ( 12 - 2 )
= 3.2 × 10
= 32
Compris ???
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Réponse :
Salut,
Explications étape par étape
4.5 × 104
= 4.5 × 100 + 4.5 × 4
= 450 + 18
= 168
15 × 1.1
= 15 × 1 + 15 × 0.1
= 15 + 1.5
= 16.5
16 × 9.9
= 16 × 10 - 16 × 0.1
= 160 - 1.6
= 158.4
3.2 × 12 - 3.2 × 2
= 3.2 × ( 12 - 2 )
= 3.2 × 10
= 32
Compris ???