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falltacko123
@falltacko123
January 2021
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Bonsoir aider moi svp a faire ces devoirs de maths qui se trouve sur la feuille et le livre l'exercice 42 c'est a rendre demain merçi d'avance
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swnn
Verified answer
A = 13/25 - 2/5
A = 13/25 - (5*2)/(5*5)
A = 13/25 - 10/25
A = 3/25
B = -31/18 - 4/3
B = -31/18 - (4*6)/(6*3)
B = -31/18 - 24/18
B = -55/18
C = 1 - 5/42
C = 42/42 - 5/42
C = 37/42
1 votes
Thanks 1
Eliott78
Verified answer
Bonjour,
Règle
: pour faire une différence avec des fractions on doit réduire au même dénominateur.
Quand on connait bien ses tables de multiplications c'est un avantage...
A = 13/25 - 2/5 = 13/25 - 10/25 = 3/25
B = - 31/18 - 4/3 = - 31/18 - 24/18 = - 55/18
C = 1 - 5/42 = 42/42 - 5/42 = 37/42
Exercice 42
a) 4/5 - 3/20 = 16/20 - 3/20 = 19/20
b) 8/9 + -2/3 = 8/9 + -6/9 = 2/9
c) 7/6 - 5/9 = 21/18 - 10/18 = 11/18
d) - 3/4 + 1/6 = - 9/12 + 2/12 = -7/12
2 votes
Thanks 1
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Verified answer
A = 13/25 - 2/5A = 13/25 - (5*2)/(5*5)
A = 13/25 - 10/25
A = 3/25
B = -31/18 - 4/3
B = -31/18 - (4*6)/(6*3)
B = -31/18 - 24/18
B = -55/18
C = 1 - 5/42
C = 42/42 - 5/42
C = 37/42
Verified answer
Bonjour,Règle : pour faire une différence avec des fractions on doit réduire au même dénominateur.
Quand on connait bien ses tables de multiplications c'est un avantage...
A = 13/25 - 2/5 = 13/25 - 10/25 = 3/25
B = - 31/18 - 4/3 = - 31/18 - 24/18 = - 55/18
C = 1 - 5/42 = 42/42 - 5/42 = 37/42
Exercice 42
a) 4/5 - 3/20 = 16/20 - 3/20 = 19/20
b) 8/9 + -2/3 = 8/9 + -6/9 = 2/9
c) 7/6 - 5/9 = 21/18 - 10/18 = 11/18
d) - 3/4 + 1/6 = - 9/12 + 2/12 = -7/12