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Sagot :

Explications étape par étape :

    A = ( -3 ) + ( 16 ) - ( -8 )

⇔ A = - 3 + 16 + 8

⇔ A = 21

    B = ( 12 ) - ( +3 ) - ( -4 )

⇔ B = 12 - 3 + 4

⇔ B = 13

    C = (-5) - (+3) - (-4)

⇔ C = -5 - 3 + 4

⇔ C = -8 + 4

⇔ C = -4

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