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Sagot :

Réponse :

1)

a) 31² - 29² = (31 + 29) (31 - 29) = 60 * 2 = 120

b) 102² - 98² = (102 + 98) (102-98) = 800

2)

a) 41*39 = 1599

b) 23*17 = 391

c) 72*68 = 4896

d) 45*55 = 2475

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