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0Arthur0
@0Arthur0
January 2021
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Encore ce DM de maths qui m'énerve ...
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rosiemuller2000
Verified answer
Coucou
Exercice 2
1,53 km = 1 530 m
1mn = 1*60 = 60s
donc
9mn = 9*60 = 540s
540s + 20s = 560 s
1530/560 ≈ 2,73 m/s
Sa vitesse est d environ 2,73 m/s.
Exercice 3
Programme
soit x le nombre choisi
(3x -8 )*2
a. x= 4
(3*4-8)*2
(12-8)*2
4*2
=8
b. x= -1,5
(3*-1,5-8)*2
=(-4,5-8)*2
= -12,5 *2
=-25
c.
(3x-8)*2=80
2*3x -8*2 = 80
6x -16 = 80
6x = 96
x = 96/6
x = 16
Pour obtenir 80, il faut choisir 16 comme nombre de depart
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0Arthur0
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Heyy! Et encore ce DM ...
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Heyy ! J'ai un DM pour demain et je suis un peu nul en maths alors merci d'avance
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Hey ! J'ai toujours ce DM Et je ne sais pas pour ces questions ; Aucun site ne les donne
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Verified answer
CoucouExercice 2
1,53 km = 1 530 m
1mn = 1*60 = 60s
donc
9mn = 9*60 = 540s
540s + 20s = 560 s
1530/560 ≈ 2,73 m/s
Sa vitesse est d environ 2,73 m/s.
Exercice 3
Programme
soit x le nombre choisi
(3x -8 )*2
a. x= 4
(3*4-8)*2
(12-8)*2
4*2
=8
b. x= -1,5
(3*-1,5-8)*2
=(-4,5-8)*2
= -12,5 *2
=-25
c.
(3x-8)*2=80
2*3x -8*2 = 80
6x -16 = 80
6x = 96
x = 96/6
x = 16
Pour obtenir 80, il faut choisir 16 comme nombre de depart