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Sagot :

[tex] \frac{2}{3} - \frac{7 }{3} \times \frac{8}{21} = - \frac{40}{63} \\ 7 \times ( - 7) + 3 \times ( - 25) \div ( - 5) = 34 \\ - 4 \times ((3 + ( - 4)) \times ( - 2 - ( - 3))) = - 4[/tex]

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