Bonjour qui pourrait m’aider pour un devoir s’il vous plaît et j’arrive pas à faire la C,D,E merci

Bonjour,

C = 3/2 + 3/5 x 5/4 - 4/3

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

C = 3/2 + (5 x 3) / (5 x 4) - 4/3

C = 3/2 + 3/4 - 4/3

C = (3 x 6) / (2 x 6) + (3 x 3) / (4 x 3) - (4 x 4) / (3 x 4)

C = 18/12 + 9/12 - 16/12

C = 11/12

D = 7/3 + 3/2 x - 10/21

D = 7/3 - 30/42

D = (7 x 14) / (3 x 14) - 30/42

D = 98/42 - 30/42

D = 68/42

D = (2 x 34) / (2 x 21)

D = 34/21

E = (3 - 7/5) : (1 - 9/10)

E = [(3 x 5) / (1 x 5) - 7/5] : [(1 x 10) / (1 x 10) - 9/10]

E = (15/5 - 7/5) : (10/10 - 9/10)

E = 8/5 : 1/10

E = 8/5 x 10

E = 80/5

E = (5 x 16) / (5 x 1)

E = 16.

bonjour

C  = 3/2 + 3 /5 * 5/4 - 4 /3

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

=  90/60 + 45/60 - 80/60

=  55/60

=   11/ 12

d  = 7/3 + 3/2 * - 10/21

= 7/3 - 30/42

= 7/3 - 5/7

=  49/21 - 15/21

=  24/21

= 8 /7

E = ( 3 - 7/5)  : ( 1 - 9 /10 )

= ( 15/5 -  7/5 )  : ( 10/10 - 9 /10 )

=  8 /5   : 1 /10

=  8/5 * 10

= 80 /5 =  16