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Sagot :

Bonjour

a. -1/5x5/-3 = 5/15 = (5 x 1) / (5 x 3) = 1/3

b. -3/5x7/9 = - 21/45 = (3 x - 7) / (3 x 15) = - 7/15

c. -5/-4x2/15 = 10/60 = (10 x 1) / (10 x 6) = 1/6.

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