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Sagot :

Bonjour,

B = 3 / 4 - 4 / 7 × 21 / 10

B = 3 / 4 - 4 / 7 × 7 × 3 / 10

B = 3 / 4 - 4 × 3 / 10

B = 3 / 4 - 12 / 10

B = 0,75 - 1,2

B = - 0,45

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