Bonjour,
Pour diviser une fraction par une autre, on multiplie par l'inverse.
a)
2/9 * -5/3 = -10/15 = -23
b)
3/5 * 5/1 = 15/5 = 3
c)
-1/4 * 1/3 = -1/12
d)
22/7 * -1/11 = -22/77
a)
3-2/3 = 9/3 -2/3 = 7/3
4/3 * 7 = 28/3
7/3 * 3/28 = 21/ 84 = 3/12
c)
(2/3)/ (5/6) = 2/3 * 6/5 = 12/15 = 4/5
4/5 - 2/5 = 2/5
d)
-3/4 + 1/2 = -3/4 +2/4 = -1/4
2/5 -5/2 = 4/10 - 25/10 = - 21/10
-1/4 * -10/21= 40/84 = 20/42 = 10/21
