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Sagot :

Bonjour

B= (1-1/3-1/4)*2/5

B = [(1 x 12) / (1 x 12) - (1 x 4) / (3 x 4) - (1 x 3) / (4 x 3)] x 2/5

B = (12/12 - 4/12 - 3/12) x 2/5

B = 5/12 x 2/5

B = 10/60

B = (10 x 1) / (10 x 6)

B = 1/6.

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