Bonsoir
8/13 x 10 = 81/13
12/15 x 17 = 204/15
18 x 1/29 = 18/29
0,5 x 3/4 = 1,5/4
1,5 x 3/4 = 4,5/4
7/3 x 0,125 = 0,875/3
2/3 x (4/3 - 1/3) = 2/3 x 3/3 = 6/3 = (3 x 2) / (3 x 1) = 2.
1/2 x (1/5 + 6/6) = 1/2 x (1/5 + 5/5) = 1/2 x 6/5 = 6/10 = (2 x 3) / (2 x 5) = 3/5
9/7 x (1/4 + 2) = 9/7 x (1/4 + 8/4) = 9/7 x 9/4 = 81/28.
