ex 9 este ala


[tex] a= ( - \frac{5}{6}) \times (\frac{2}{15} \div \frac{1}{5}) + ( {5}^{ - 1} \times 5 \times \frac{1}{2} - 3 \times \frac{5}{6} ) + {3}^{ - 1} = ...[/tex]
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