Sagot :

maudmarine

Bonjour

A= 1/4-1/6-1/8

A = (1 x 6) / (4 x 6) - (1 x 4) / (6 x 4) - (1 x 3) / (8 x 3)

A = 6/24 - 4/24 - 3/24

A = - 1/24

B=5/12-7/12×3/5

B = 5/12 - 21/60

B = (5 x 5) / (12 x 5) - 21/60

B = 25/60 - 21/60

B = 4/60

B = (4 x 1) / (4 x 15)

B = 1/15.