Bonjour à tous, pouvez-vous m'aider pour cet exercice de maths.(5e) (EN DÉTAILLANT SVP) I) Calculer : A= (-8)+(+3)-(-12)-(+7) B= (–3,7) – (+12,3) – (–15,4) C =
Question
I) Calculer :
A= (-8)+(+3)-(-12)-(+7)
B= (–3,7) – (+12,3) – (–15,4)
C = (–5) – (–6) – (+12) + (+16) + (–15)
II) Calculer ASTUCIEUSEMENT !:
A = 17,02 + (−13,7) + 2,25 + (−7,02) + (−1,2) + (−3,3) + (−1,05)
B = − 7 + 24 − 33 − 14 + 23 + 37
C = 15 − 22 − 7 + 15 − 8 + 7
III) Calculer :
A = –4 – (6 – 11 + 3)
B = –13 + (–18 + 7)
C = –37 – (45 – 63)
MERCI D'AVANCE ! Et bonne vacances !
1 Réponse
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1. Réponse maudmarine
Bonjour
I) Calculer :
A= (-8)+(+3)-(-12)-(+7)
A = - 8 + 3 + 12 - 7
A = - 8 - 7 + 12 + 3
A = - 15 + 15
A = 0
B= (–3,7) – (+12,3) – (–15,4)
B = - 3,7 - 12,3 + 15,4
B = - 16 + 15,4
B = - 0,6
C = (–5) – (–6) – (+12) + (+16) + (–15)
C = - 5 + 6 - 12 + 16 - 15
C = - 5 - 15 - 12 + 6 + 16
C = - 32 + 22
C = - 10
II) Calculer ASTUCIEUSEMENT :
A = 17,02 + (−13,7) + 2,25 + (−7,02) + (−1,2) + (−3,3) + (−1,05)
A = 17,02 - 13,7 + 2,25 - 7,02 - 1,2 - 3,3 - 1,05
A = - 13,7 - 3,3 + 17,02 - 7,02 + 2,25 - 1,05 - 1,2
A = - 20 + 10 + 1,2 - 1,2
A = - 10
B = − 7 + 24 − 33 − 14 + 23 + 37
B = - 7 - 33 - 14 + 23 + 37 + 24
B = - 40 - 14 + 60 + 24
B = - 54 + 84
B = 30
C = 15 − 22 − 7 + 15 − 8 + 7
C = - 7 + 7 + 15 + 15 - 8 - 22
C = 30 - 30
C = 0
III) Calculer :
A = –4 – (6 – 11 + 3)
A = - 4 - 6 + 11 - 3
A = - 13 + 11
A = - 2
B = –13 + (–18 + 7)
B = - 13 - 18 + 7
B = - 31 + 7
B = - 24
C = –37 – (45 – 63)
C = - 37 - 45 + 63
C = - 82 + 63
C = - 19.