Bonjour,
a) 20 = 4*5 donc
(3 * 4* 5 ) / 5 = 3*4 = 12
b) 24 = 4*6 donc
(4 * 6 * 7)/4 = 6 * 7 = 42
c) 36 = 9 * 4
(1 * 9 * 4) / 4 = 1 * 9 = 9
d) 36.9 = 3 * 12.3
( 7 * 12.3 * 3) / 3 = 7 * 12.3 = 86.1
e) 21 = 3 * 7
(31 * 3 * 7) / 7 = 31 * 3 = 93
Bonne soirée
