Question

Хееееееееелп!!!!помогите плиЗ!!!!!
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Answer 1

$\frac{\frac{9}{10}-\frac{2}{3} }{\frac{5}{6} +\frac{4}{5} }=\frac{9}{10}-\frac{2}{3} :\frac{5}{6} +\frac{4}{5}= \frac{27}{30}- \frac{20}{30} : \frac{25}{30} +\frac{24}{30} =\frac{7}{30}: \frac{49}{30}=\frac{7*30}{30*49} =\frac{1}{7}$