Question

1) 22/21∙5/14-20/21∙5/14
2) (47∙1/26)∙13/27-(20∙1/26)∙13/27

Answer 1

Объяснение:

$1) \: \: \frac{22}{21} \times \frac{5}{14} - \frac{20}{21} \times \frac{5}{14} = ( \frac{22}{21} - \frac{20}{21} ) \times \frac{5}{14} = \frac{2}{21} \times \frac{5}{14} = \frac{1}{21} \times \frac{5}{7} = \frac{5}{147}$

$2) \: \: (47 \times \frac{1}{26} ) \times \frac{13}{27} - (20 \times \frac{1}{26} ) \times \frac{13}{27} = (47 - 20) \times ( \frac{1}{26} \times \frac{13}{27} ) = 27 \times (\frac{1}{2} \times \frac{1}{27} ) = \frac{27}{1} \times \frac{1}{54} = \frac{1}{1} \times \frac{1}{2} = \frac{1}{2}$