bonjour, j ai un problème avec un exercice, pouvez m aider?,je vous donne les question effectue les calculs en respectant les priorité opératoires a 1/5 x -4/3

Bonjour,

a 1/5 x -4/3 +7/2

= - 4/15 + 7/2

= (- 4 x 2) / (15 x 2) + (7 x 15) / (2 x 15)

= - 8/30 + 105/30

= 97/30

b 3/2 +3/5 x 5/4 -4/3

= 3/2 + 15/20 - 4/3

= (3 x 30) / (2 x 30) + (15 x 3) / (20 x 3) - (4 x 20) / (3 x 20)

= 90/60 + 45/60 - 80/60

= 135/60 - 80/60

= 55/60

= (5 x 11) / (5 x 12)

= 11/12

c 13/7 +( - 8/7) x (- 5/4)

= 13/7 + 40/28

= (13 x 4) / (7 x 4) + 40/28

= 52/28 + 40/28

= 92/28

= (4 x 23) / (4 x 7)

= 23/7.

Bonjour

A 1/5  x -4/3 +7/2 = -4/15 + 7/12 = -16/60 + 35/60 = 19/60

b 3/2 +3/5 x 5/4 -4/3 = 3/2 + 15/20 -4/3 = 3/2 + 3/4 -4/3 = 18/12 + 9/12 -16/12 = 27/12 -16/12 = 11/12

c 13/7 +( - 8/7) x (- 5/4) = 13/7 + 40/28 = 52/28 + 40/28 = 92/28 = 23/7