Bonjour, il faudrait calculer ceci mais je n'y arrive pas : -7/5:(2/9 - 7/18) et (4/5+-3/2) : (-9/4 - 1/6) Thanksss ;))

Bonjour,

-7/5:(2/9 - 7/18)

= - 7/5 : [(2 x 2) / (9 x 2) - 7/18]

= - 7/5 : (4/18 - 7/18)

= - 7/5 : (- 3/18)

= - 7/5 x (- 18/3)

= 126/15

= (3 x 42) / (3 x 5)

= 42/5

(4/5+-3/2) : (-9/4 - 1/6)

= [(4 x 2) / (5 x 2) - (3 x 5) / (2 x 5)] : [(- 9 x 3) / (4 x 3) - (1 x 2) / (6 x 2)]

= (8/10 - 15/10) : (- 27/12 - 2/12)

= - 7/10 : - 29/12

= - 7/10 x - 12/29

= 84/290

= (2 x 42) / (2 x 145)

= 42/145.