bonsoir aidez moi svp = 53/30 - (6/10+8/10) = 7/6×7/2-3/2 = 3/7+(17/14-23/28)

   53/30 - (6/10 + 8/10)
= 53/30 - 14/10
= 53/30 - 42/30
= 11/30

   7/6 × 7/2 - 3/2
= 49/12 - 3/2
= 49/12 - 18/12
= 31/12

   3/7 + (17/14 - 23/28)
= 3/7 + (34/28 - 23/28)
= 3/7 + 11/28
= 12/28 + 11/28
= 23/28

A = 53/30 - (6/10 + 8/10)
A = 53/30 - (6 + 8)/10
A = 53/30 - 14/10
A = 53/30 - 42/30
A = (53 - 42)/30
A = 11/30



B = (7/6×7/2) - 3/2
B = 49/12 - 3/2
B = 49/12 - 18/12
B = (49 - 18)/12
B = 31/12



C = 3/7 + (17/14 - 23/28)
C = 3/7 + (34/28 - 23/28)
C = 3/7 + (34 - 23)/28
C = 3/7 + 11/28
C= 12/28 + 11/28
C= (12 + 11)/28
C= 23/28