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karapet
@karapet
June 2021
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Ecrire le calcul correspondant à chaque phrase, puis l'effectuer :
a) la somme de 7/16 et du produit de 3/8 par 5/2 ;
b) la différence entre le produit de 4 par 5/6 e le produit de 2/3 par 7/2 ;
c) le produit de la somme de 8/9 et 4/3 par la différence entre 7/5 et 1/20 .
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bouki83
A) 7/16 + (3/8)×(5/2) = 7/16 + (3×5/8×2)=7/16 + 15/16 =22/16 = 11/8
b) 4×(5/6) - (2/3)×(7/2)= 20/6 - 14/6 = 6/6 = 1
c) (8/9 + 4/3)× ( 7/5 - 1/20) = [ 8/9 +(4×3 )/(3×3)]×[(7×4)/(5×4) - 1/20 ]
= (8/9 + 12/9) ×( 21/20 -1/20)
=(20/9)×(20/20)
=(20/9)×1
=20/9
0 votes
Thanks 2
karapet
Merci beaucoup la tu m'a sauvée la vie MERCI!!!
bouki83
de rien
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b) 4×(5/6) - (2/3)×(7/2)= 20/6 - 14/6 = 6/6 = 1
c) (8/9 + 4/3)× ( 7/5 - 1/20) = [ 8/9 +(4×3 )/(3×3)]×[(7×4)/(5×4) - 1/20 ]
= (8/9 + 12/9) ×( 21/20 -1/20)
=(20/9)×(20/20)
=(20/9)×1
=20/9