bonjour a tous ai besoin de vous svp merci. Calculer les expressions suivantes: A=3:7+5:2; B=-5:3+7:8; C=-8:5-5:3; D=1:9- -7:4;

Bonjour,

A= 3/7 + 5/2
A = 3 x 7 / 2 x 7 + 5 x 7 / 2 x 7
A = 21/14 + 35/14
A = 56/14
A = 14 x 4 / 14 x 1
A = 4

B = - 5/3 + 7/8
B = - 5 x 8 / 3 x 8 + 7 x 3 / 8 x 3
B = - 40/24 + 21/24
B = - 19/24

C = - 8/5 - 5/3
C = - 8 x 3 / 5 x 3 - 5 x 5 / 3 x 5
C = - 24/15 - 25/15
C = - 49/15

D = 1/9 - 7/4
D = 1 x 4 / 9 x 4 - 7 x 9 / 4 x 9
D = 4/36 - 63/36
D = - 59/36