Bonsoir,
a. 9/72 = (9 x 1) / (9 x 8) = 1/8
Donc 4/5 ; 1/8
b. 182/56 = (14 x 13) / (14 x 4) = 13/4
Donc 25/3 ; 13/4
c. 1/2 ; 13
d. 28/140 = (28 x 1) / (28 x 5) = 1/5
Donc 1/5 ; 1/3
e. 2/5 ; 1/5
f. 6/7 ; 1/5
g. 66/132 = (66 x 1) / (66 x 2) = 1/2
Donc 13/4 ; 1/2
h. 125/15 = (5 x 25) / (5 x 3) = 25/3
66/110 = (22 x 3) / (22 x 5) = 3/5
Donc 25/3 ; 3/5
i. 208/260 = (52 x 4) / (52 x 5) = 4/5
Donc 3/5 ; 4/5
j. 20/50 = (10 x 2) / (10 x 5) = 2/5
Donc 1/8 ; 2/5
k. 18/54 = (18 x 1) / (18 x 3) = 1/3
65/5 = (5 x 13) / (5 x 1) = 13/1
Donc 1/3 ; 13/1
l. 25/125 = (25 x 1) / (25 x 5) = 1/5
120/140 = (20 x 6) / (20 x 7) = 6/7
Donc 1/5 ; 6/7.