Bonjour à toi aussi !!!
a 1-1/3x9/8
= 1 - 9/24
= (1 x 8) / (1 x 8) - (3 x 3) / (3 x 8)
= 8/8 - 3/8
= 5/8
b (1-1/3)x9/8
= [(1 x 3) / (1 x 3) - 1/3] x 9/8
= (3/3 - 1/3) x 9/8
= 2/3 x 9/8
= 18/24
= (6 x 3) / (6 x 4)
= 3/4
c 2/3+1/3:8/9
= 2/3 + 1/3 x 9/8
= (2 x 8) / (3 x 8) + 9/24
= 16/24 + 9/24
= 25/24
d 2/3+1/3:8/9
Idem que c.
