Réponse :
bonjour
147 = 3 x 7 ²
105 = 3 x 5 x 7
PGCD = 3 x 7 = 21
147/105 = 7/5
72 = 2 ³ x 3 ²
108 = 2² x 3 ³
PGCD = 2 ²x 3² = 36
72/108 = 2/3
continue
Bonjour,
147/105
147 / 3 =49
49/7= 7
=> 3*7*7
105/3=35
35/5=7
=> 3*5*7
En commun:
3*7 = 21
147/21=7
105/21 =5
147/105 = 7/5
72/108
72/2 = 36
36/2 = 18
18/2 = 9
9/3 = 3
=> 2*2*2*3*3
108/2 = 54
54/2= 27
27/3 =9
9/3=3
2*2*3*3*3
en commun
2*2*3*3 = 36
même technique pour simplifier
84/92
84/2 = 42
42/2 = 21
21/3 =7
=> 2*2*3*7
92/2 = 46
46/2= 23
=> 2*2*23
en commun:
2*2 = 4
660/510
660/2= 330
330/2=165
165/3 =55
55/5=11
=> 2*2*3*5*11
510/2 =255
255/3 =85
85/5=17
=> 2*3*5*17
en commun:
2*3*5 = 30