a)
5
5 * 3 = 15
15 + 4 = 19
19 * 2 = 38
38 - 4 = 34
En prenant 5 comme nombre de départ, on obtient 34.
b)
x
3x
3x + 4
2(3x + 4) = 6x + 8
6x + 8 - 4 = 6x + 4
Donc 6x + 4 = 809.2
6x = 809.2 - 4
6x = 805.2
x = 805.2/6
x = 134.2
Si on prendre 134.2 on obtiendra 809.2
c)
x
3x
3x + 4
2(3x + 4) = 6x + 8
6x + 8 - 4 = 6x + 4
Donc 6x + 4 = 14
6x = 14 - 4
6x = 10
x = 10/6
Si on prendre 10/6 on obtiendra 14
d)
x
3x
3x + 4
2(3x + 4) = 6x + 8
6x + 8 - 4 = 6x + 4