Sagot :
21/8 - 5/8 x 3/10 = 21/8 - 48/80 = 210/80 - 48/80 = 162/80 = 81/40
1/2 + 9/10 x 5/21 = 1/2 + 45/210 =7/14 + 3/14 = 10/14 = 5/7
15/4 + 5/12 : 10/9 = 15/4 + 3/8 = 30/8 + 3/8 = 33/8
5 x 9/10 x 5/21 = 45/10 x 5/21 = 9/2 x 5/21 = 45/42 = 15/14
Bonjour,
21/8 - 5/8 * 3/10 = 21/8 - 15/80 = 210/80 - 15/80 = 195/80 = 39/16
1/2 + 9/10 * 5/21 = 1/2 + 45/210 = 102/210 + 45/210 = 147/210 = à simplifier si nécessaire
15/4 + 5/12 : 10/9 = 15/4 + 5/12 * 9/10 = 15/4 + 45/120 = 450/120 + 45/120 = 495/120 à simplifier
5 * 9/10 - 7/10 = 45/10 - 7/10 = 38/10 = 19/5