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Aylin005
@Aylin005
May 2019
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Bonjour
Pouvezzlaider à exercice 39 en gardant les parenthèses svp
Merci
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remilesochalieoz9a2c
Salut ! :)
On va d'abord remplacer les signes - en utilisant la règle : Soustraire un nombre, c'est additionner son opposé :
A = (+8) + (-3) - (-7) + (+6) - (+12) + (-5)
= (+8) + (-3)
+ (+7)
+ (+6)
+ (-12)
+ (-5)
B = (-4) - (-3) - (+15) + (-11) + (-7) - (-13)
= (-4)
+ (+3)
+ (-15)
+ (-11) + (-7)
+ (+13)
C = (-11) + (-9) - (+6) - (-11) - (-13) + (+7)
= (-11) + (-9)
+ (-6)
+ (+11)
+ (+13)
+ (+7)
Ensuite, on fait les calculs de gauche à droite
A = (+8) + (-3) + (+7) + (+6) + (-12) + (-5)
= (+5) + (+7) + (+6) + (-12) + (-5)
= (+12) + (+6) + (-12) + (-5)
= (+ 18) + (-12) + (-5)
= (+6) + (-5)
= +1
Je le laisse faire B et C tout seul en suivant la même méthode ! :)
1 votes
Thanks 1
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Lista de comentários
On va d'abord remplacer les signes - en utilisant la règle : Soustraire un nombre, c'est additionner son opposé :
A = (+8) + (-3) - (-7) + (+6) - (+12) + (-5)
= (+8) + (-3) + (+7) + (+6) + (-12) + (-5)
B = (-4) - (-3) - (+15) + (-11) + (-7) - (-13)
= (-4) + (+3)+ (-15) + (-11) + (-7) + (+13)
C = (-11) + (-9) - (+6) - (-11) - (-13) + (+7)
= (-11) + (-9) + (-6)+ (+11)+ (+13) + (+7)
Ensuite, on fait les calculs de gauche à droite
A = (+8) + (-3) + (+7) + (+6) + (-12) + (-5)
= (+5) + (+7) + (+6) + (-12) + (-5)
= (+12) + (+6) + (-12) + (-5)
= (+ 18) + (-12) + (-5)
= (+6) + (-5)
= +1
Je le laisse faire B et C tout seul en suivant la même méthode ! :)