Bonjour,
a)
14/6 * 3/3 = 42/18
3/9 * 2/2 =6/18
(42/18 -6/18) * -3/4
= 36/18 *3/4
= 108/72 =54/36 = 27/18 = 9/6 = 3/2
b)
(11/15 -3/25) /9/35
11/15 * 5/5 = 55/75
3/25 *3/3 = 9/75
55/75 - 9/75 =46/75
46/75 / 9/35
= 46/75 * 35/9
= 28/15
