Question

плииизз очень нуужноо!!!​

Answer 1

Ответ:

1)

$( - 2 \frac{5}{9} + 1 \frac{20}{21} ) \div 1 \frac{8}{49} - 1 \frac{7}{9} \div 6 = ( - \frac{23}{9} + \frac{41}{21} ) \div \frac{57}{49} - \frac{16}{9} \div 6 = ( \frac{ - 161 + 123}{63} ) \div \frac{57}{49} - \frac{16}{9 \times 6} = - \frac{38}{63} \div \frac{57}{49} - \frac{16}{54} = - \frac{38 \times 49}{63 \times 57} - \frac{8}{27} = - \frac{2 \times 7}{9 \times 3} - \frac{8}{27} = - \frac{14}{27} - \frac{8}{27} = - \frac{22}{27}$

2)

$(5 \frac{5}{9} - 6.8) \div (2 \frac{13}{30} - 2 \frac{1}{12} ) \times 3.6 = ( \frac{50}{9} - 6 \frac{4}{5} ) \div ( \frac{73}{30} - \frac{25}{12} ) =( \frac{50}{9} - \frac{34}{5} ) \div ( \frac{146 - 125}{60} ) = ( \frac{250 - 170}{45} ) \div \frac{21}{60} = \frac{80}{45} \div \frac{7}{20} = \frac{16}{9} \div \frac{7}{20} = \frac{16 \times 20}{9 \times 7} = \frac{320}{63} = 5 \frac{5}{63}$

Answer 2

Ответ: в фото

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