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Sagot :

[tex]bonjour[/tex]

[tex]a = \frac{4}{3} - ( \frac{1}{2} + \frac{7}{8})[/tex]

[tex]a = \frac{4}{3} - \frac{11}{8} [/tex]

[tex]a = \frac{ - 1}{24} [/tex]

[tex]b = \frac{4}{3} - \frac{7}{5} - ( \frac{3}{5} - \frac{5}{7} )[/tex]

[tex]b = \frac{4}{3} - \frac{7}{5} - ( - \frac{4}{35} )[/tex]

[tex]b = \frac{4}{3} - \frac{7}{5} + \frac{4}{35} [/tex]

[tex]b = \frac{1}{21} [/tex]

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