quelqu'un peut me résoudre cet exercice svp​

Bonsoir,

a)

14/25 * 5/7 = 70/175 = 14/35= 2/5

b)

5/6 + 3/7 * - 7/3

=5/6  - 21/21

=  5/6 -1

= 5/6 - 6/6 = -1/6

c)

(1/6 + 1/3) ( 5/8 -1/4)

= (1/6 + 2/6) ( 5/8 -2/8)

=  3/6 * 3/8

= 1/3 * 3/8

= 3/24 = 1/8

d)

(737*-521)/ -3,1

= - 383 977/-3,1 = 123 863, 5 484

bonsoir

A =  14/25 x 5/7

A =  2/5 x  1 = 2/5

B =  5/6 + ( - 21/21 )

b =  5/6  - 1 =  - 1 /6

C = ( 1/6 + 1/3 ) x (5/8 - 1 /4 )

  =  ( 1/6 + 2/6 ) x ( 5/8 - 2/8 )

  =  3/6 x 3/8 = 9/48 = 3/16

D =  (737 x - 521 ) : - 3.1 =   - 383977/ - 3.1 =  3839770 /31