Sagot :
Réponse :
Explications étape par étape
Bonjour
Donner le résultat sous la forme d’une fraction irréductible :
7/5 x 3/4 + 7/3 x 4/5
= (7 x 3)/(5 x 4) + (7 x 4)/(3 x 5)
= 21/20 + 28/15
= (21 x 3)/(20 x 3) + (28 x 4)/(15 x 4)
= 63/60 + 112/60
= (63 + 112)/60
= 175/60
= (5 x 35)/(5 x 12)
[tex]\bf{= 35/12}[/tex]
(7 - 3 x 2)/12 - (3 + 3 x 3)/(5 x 5 - 5)
= (7 - 6)/12 - (3 + 9)/(25 - 5)
= 1/12 - 12/20
= (1 x 5)/(12 x 5) - (12 x 3)/(20 x 3)
= 5/60 - 36/60
[tex]\bf{= -31/60}[/tex]
Bonjour
1)
7/5 x 3/4 + 7/3 x 4/5
= 21/20 + 28/15
= (21 x 3) / (20 x 3) + (28 x 4) / (15 x 4)
= 63/60 + 112/60
= 175/60
= (5 x 35) / (5 x 12)
= 35/12
2)
(7 - 3 x 2) / 12 - (3 + 3 x 3) / (5 x 5 - 5)
= (7 - 6)/12 - (3 + 9) / (25 - 5)
= 1/12 - 12/20
= (1 x 15) / (12 x 5) - (12 x 3) / (20 x 3)
= 15/60 - 36/60
= - 21/60
= (3 x - 7) / (3 x 20)
= - 7/20.