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Sagot :

MAUDMARINE

Bonjour

B = 3/4 x (1/5 - 3/10)

B = 3/4 x [(1 x 2) / (5 x 2) - 3/10]

B = 3/4 x (2/10 - 3/10)

B = 3/4 x (- 1/10)

B = - 3/40

C = 10/9 - 5/9 x 5/3

C = 10/9 - 25/27

C = (10 x 3) / (9 x 3) - 25/27

C = 30/27 - 25/27

C = 5/27.

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