Răspuns:
[tex]\displaystyle \frac{9}{10} \ : \ 6 \frac{6}{7} \ : \ 3 \ = \ \frac{9}{10} \ : \ \frac{6 \ \cdot 7 \ + \ 6}{7} \ : \ 3 \ = \frac{9}{10} \ : \ \frac{48}{7} \ : \ 3 \ = \ \frac{9}{10} \ \cdot \ \frac{7}{48} \ \cdot \ \frac{1}{3} \ = \ \frac{7}{160 }[/tex]
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