Calculer et donner le résultat sous la forme la plus simple possible A=7/5 - 7/3 × 15/14 B=8/5 - 3/4 ÷ 9/8 C=8/3 - 2/5 / 7/5

bonjour

a = 7/5 - 105/42
a = 294/210 - 525/210
a = - 231/210= - 11/10

b = 8/5 - 3/4 : 9/8
b = 8/5 - 3/4 x 8/9
b = 8/5 - 24/36
b = 8/5 - 2/ 3
b = 24/15 - 10/15 = 14/15

c = 8/3  - 2/5 : 7/5
c = 8/3 - 2/5 x 5/7
c = 8/3 - 10/35
x = 280/105 - 30/105
c = 250/105  = 50/21