Verified answer

Réponse :

Bonjour

* signifie multiplier

B = 11/15 - 7/10

B = (11*4)/(15*4) - (7*6)/(10*6)

B= 44/60 - 42/60

B = 2/60 = 1/30



C = 1/4 + 3/7

C = (1*7)/(4*7) + (3*4)/(7*4)

C = 7/28 + 12/28

C = 19/28



D = 1/5 + 3/11

D = (1*11)/(5*11) + (3*5)/(11*5)

D = 11/55 + 15/55

D = 26/55

E = 1/6 - 5/21

E =(1*21)/(6*21) - (5*6)/(21*6)

E= 21/126 - 30/126

E = - 9 /126 = 1/14

F = 2/7 - 3

F = 2/7 - 3/1

F = 2/7 - ( 3*7)/(1*7)

F = 2/7 - 21/7

F = - 19/7