faut que la fraction soit irreductible : 1) a. (-2)/9 ×(-5)/9 b. 3/8 × 4 2) a. 5/4 : 2/7 b. 3/2 : 11/7 c. (-11)/8 : (-2)/3

1)
a) - (2)/9 x (- 5)/9
= 10/81

b) 3/8 x 4
= 12/8
= 4 x 3 / 4 x 2
= 3/2

2)
a) 5/4 : 2/4
= 5/4 x 4/2
= 20/8
= 4 x 5 / 4 x 2
= 5/2

b) 3/2 : 11/7
= 3/2 x 7/11
= 21/22

c) (- 11)/8 : (- 2)/3
= - 11/8 x - 3/2
= 33/16

1
a -2/9 x-5/9 = 10/81
b 3/8 x 4 = 3x4/2x4 = 3/2

2
a 5/4:2/7 = 5/4 x 7/2 = 35/8
b 3/2: 11/7 = 3/2 x 7/11 = 31/22
c -11/8 : -2/3 = 11/8 x 3/2 = 33/16