a 1-1/3x9/8 b (1-1/3)x9/8 c 2/3+1/3:8/9 d 2/3+1/3:8/9​

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.

Bonjour

A 1-1/3x9/8

A = 1 - 9/3 x 1/8

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

A = 1 - 3 x 1/8

A = 8/8 - 3/8

A = 5/8

b (1-1/3)x9/8

B = (3/3 - 1/3) x 9/8

B = 2/3 x 9/8

B = 9/3 x 2/8

B = (3 x 3)/3 x 2/(4 x 2)

B = 3 x 1/4

B = 3/4

c 2/3+1/3:8/9

C = 2/3 + 1/3 x 9/8

C = 2/3 + 9/3 x 1/8

C = 2/3 + (3 x 3)/3 x 1/8

C = 2/3 + 3 x 1/8

C = 2/3 + 3/8

C = (2 x 8)/(3 x 8) + (3 x 3)/(8 x 3)

C = 16/24 + 9/24

C = 25/24

D 2/3+1/3:8/9​ idem à C)