Bonjour j’ai du mal avec cet exo 2.Calculer 3/8 + -5/18= ..? -5/8- -1/18..? 7/18+1/8. -1 =..?

Réponse :

Explications étape par étape

Bonjour

2.Calculer

3/8 + -5/18=

= (3 x 9)/(8 x 9) - (5 x 4)/(18 x 4)

= 27/72 - 20/72

= 7/72

-5/8- -1/18 =

= -5/8 + 1/18

= (-5 x 9)/(8 x 9) + (1 x 4)/(18 x 4)

= -45/72 + 4/72

= -41/72

7/18+1/8. -1 =

= (7 x 4)/(18 x 4) + (1 x 9)/(8 x 9) - (1 x 72)/(1 x 72)

= 28/72 + 9/72 - 72/72

= 37/72 - 72/72

= -35/72

Bonjour,

2.Calculer

3/8 + -5/18

= (3 x 9) / (8 x 9) - (5 x 4) / (18 x 4)

= 27/72 - 20/72

= 7/72

-5/8- -1/18

= (- 5 x 9) / (8 x 9) + (1 x 4) / (18 x 4)

= - 45/72 + 4/72

= - 41/72.

7/18+1/8. -1

= (7 x 4) / (18 x 4) + (1 x 9) / (8 x 9) - (1 x 72) / (1 x 72)

= 28/72 + 9/72 - 72/72

= - 35/72