Réponse :

Explications étape par étape

Bonsoir

Simplifier les fractions :

-63/42

= -(3 x 21)/(2 x 21)

= -3/2

12/105

= (3 x 4)/(3 x 35)

= 4/35

Calculer et simplifier :

-5,4/3 + 4,2/3

= (-5,4 + 4,2)/3

= -1,2/3

= -12/30

= (-6 x 2)/(6 x 5)

= -2/5

-12/7 - 3/7

= -(12 + 3)/7

= -15/7

-5/3 x 7/5

= -5/5 x 7/3

= -1 x 7/3

= -7/3

2,4 x 5/3

= (2,4 x 5)/3

= 12/3

= (3 x 4)/3

= 4

-3 + 3/5

= (-3 x 5)/(1 x 5) + 3/5

= -15/5 + 3/5

= (-15 + 3)/5

= -12/5

7/15 - 1/5

= 7/15 - (1 x 3)/(5 x 3)

= 7/15 - 3/15

= (7 - 3)/15

= 4/15