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maryneberrue
@maryneberrue
June 2021
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Quelqu'un pourrais-t-il m'aider svp? Pour l'exercice 2
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maudmarine
Verified answer
A = 2/35 et B = 21/4
Calculer
:
a)
La somme de A et B
:
2/35 + 21/4
= 2 x 14 / 35 x 4 + 21 x 35 / 4 x 35
= 28/140 + 735/140
= 763/140
= 7 x 109 / 7 x 20
= 109/20
b)
La différence de A et B
:
2/35 - 21/4
= 2 x 14 / 35 x 4 - 21 x 35 / 4 x 35
= 28/140 - 735/140
= 707/140
= 7 x - 101 / 7 x 20
= - 101/20
c)
Le produit de A par B :
2/35 x 2/14
= 4/490
= 2 x 2 / 2 x 245
= 2/245
d)
Le quotient de A par B :
2/35 : 2/14
= 2/35 x 14/2
= 28/70
= 14 x 2 / 14 x 5
= 2/5
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suarezjosianne
erreur de calcul21/4 devient 21/14
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Verified answer
A = 2/35 et B = 21/4Calculer :
a) La somme de A et B :
2/35 + 21/4
= 2 x 14 / 35 x 4 + 21 x 35 / 4 x 35
= 28/140 + 735/140
= 763/140
= 7 x 109 / 7 x 20
= 109/20
b) La différence de A et B :
2/35 - 21/4
= 2 x 14 / 35 x 4 - 21 x 35 / 4 x 35
= 28/140 - 735/140
= 707/140
= 7 x - 101 / 7 x 20
= - 101/20
c) Le produit de A par B :
2/35 x 2/14
= 4/490
= 2 x 2 / 2 x 245
= 2/245
d) Le quotient de A par B :
2/35 : 2/14
= 2/35 x 14/2
= 28/70
= 14 x 2 / 14 x 5
= 2/5