выполните действие 1) (-2 5/9 + 1 20/21) : 1 8/49 - 1 7/9 : (-6)

1. -2 \frac{5}{9} + 1 \frac{20}{21}= - \frac{23}{9} + \frac{41}{21}= - \frac{161}{63} + \frac{123}{63}= - \frac{38}{63} 2. - \frac{38}{63}: 1 \frac{8}{49}=- \frac{266}{513} 3. 1 \frac{7}{9} :(-6) = \frac{16}{9}: (-6)= -\frac{16}{54} 4, -\frac{266}{513}- (- \frac{16}{54}) = - \frac{266}{513}+ \frac{16}{54}= - \frac{532}{1026}+ \frac{304}{1026}= -\frac{228}{1026}= - \frac{114}{513}=- \frac{2}{9} Ура, я гений!