Réponse :

Bonsoir

A = 101 × 99

A = (100 + 1) (100 - 1)

A = 100² - 1²

A = 10 000 - 1

A = 9 999

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B = 105 × 95

B = ( 100 + 5)( 100 - 5)

B = 100² - 5²

B = 10 000 - 25

B = 9975

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C = 47² - 53²

C = (47 - 53)(47 + 53)

C = (- 6) (100)

C = ( - 600)

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D = 93² - 103²

D = (93 - 103)(93 + 103)

D = (-10)(196)

D = ( - 1960)