Explications étape par étape:
salut
15 x 13 = 15 x (10+3) = 15 x 10 + 15 x 3 = 150 + 45 = 195
15 x 8 = 8 x (10+5) = 8 x 10 + 8 x 5 = 80 + 40 = 120
voilà ;)
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Explications étape par étape:
salut
15 x 13 = 15 x (10+3) = 15 x 10 + 15 x 3 = 150 + 45 = 195
15 x 8 = 8 x (10+5) = 8 x 10 + 8 x 5 = 80 + 40 = 120
voilà ;)