Bonjour pouvais vous m'aider. Merci d'avance ​

bonjour,

1/2 + 5/3 x 1/4 = 1/2 + 5/12 = 6/12 + 5/12 = 11/12

6/7 x 14/24 + 3/2 = 6/7 x 7/12 + 3/2 = 42/84 + 3/2

= 1/2 + 3/2 = 4/2 = 2

2/5 + 3/10 - 3/4 x 1/5 = 2/5 + 3/10 - 3/20

=  8/20 + 6/20 - 3/20 = 11/20

( 3/7 + 5/14) x ( 3/11 + 1/22)

= ( 6/14 + 5/14) x ( 6/22 + 1/22)

= 11/14 x 7/22 = 77/308 = 1 4

13/4 - [ 5/8 + 3/2 x 1/8 ]

= 13/4 - ( 5/8 + 3/16)

= 13/4 - (  10/16 + 3/16)

= 13/4 - 13/16 = 52/16 - 13/16 = 39/16