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Sagot :

Réponse:

coucou,

A=

[tex]a . - 5 \times + 4 \times \frac{2}{7} = - \frac{27}{7} [/tex]

B =

[tex]b. ( \frac{2}{7} - \frac{8}{3} ) \div 5 = - \frac{10}{21} [/tex]

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