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Sagot :

COMPTEMON160

Bonsoir,

[3×7-(18-9)]×2+(9×3-12-1)÷2

= [3×7-9]×2+(9×3-12-1)÷2

=[21-9]×2+(9×3-12-1)÷2

=12×2+(9×3-12-1)÷2

=12×2+(27-12-1)÷2

=12×2+14÷2

=24+14÷2

=24+7

= 31

Voilà pour toi, j'espère t'avoir aidé, bonne journée :)

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