Bonsoir,  

1)

a. 42 = 14 x 3 = 2 x 7 x 3

b. 70 = 35 x 2 = 7 x 5 x 2

c. 180 = 9 x 20 = 3 x 3 x 2 x 2 x 5

d. 125 = 25 x 5 = 5 x 5 x 5

2)

a. 462 = 42 x 11 = 2 x 3 x 7 x 11

b. 1 000 = 10 x 100 = 2 x 5 x 2 x 2 x 5 x 5

c. 195 = 15 x 13 = 3 x 5 x 13

d. 136 = 17 x 8 = 17 x 2 x 2 x 2

Réponse :

bonsoir

Explications étape par étape

42=7x2x3

70=7x5x2

180=3x3x5x2x2

125=5x5x5

462=7x3x2x11

1000=5x2x5x2x5x2

195=5x3x13

136=17x2x2x2