7/6-3/5 x 5/14=. 2/5-2/5:4/7=. (3/4-8/7) : (3/14-1/2) bonjour pouvez vous m’aider merci d’avance

Bonjour,

7/6 - 3/5 x 5/14

= 7/6 - 15/60

= (7 x 10) / (6 x 10) - 15/60

= 70/60 - 15/60

= 55/60

= (5 x 11) / (5 x 10)

= 11/10

2/5 - 2/5 : 4/7

= 2/5 - 2/5 x 7/4

= 2/5 - 14/20

= (2 x 4) / (5 x 4) - 14/20

= 8/20 - 14/20

= 6/20

= (2 x 3) / (2 x 10)

= 3/10

(3/4-8/7) : (3/14-1/2)

= [(3 x 7) / (4 x 7) - (8 x 4) / (7 x 4)] : [3/14 - (1 x 7) / (2 x 7)]

= (21/28 - 32/28) : (3/14 - 7/14)

= - 11/28 : - 4/14

= - 11/28 x - 14/4

= 154/112

= (14 x 11) / (14 x 8)

= 11/8.