Question

2целых 13/14 - 1целая 20/21 ,8целых 3/4 -7целых 5/6,2целых 5/8 -1 целая 3/10 ,8целых 19/20 - 3целые 20/21 . Помогите решить

Answer 1

Ответ:

$2 \frac{13}{14} - 1 \frac{20}{21} = \frac{41}{14} - \frac{41}{21} = \frac{41}{42} \\ 8 \frac{3}{4} - 7 \frac{5}{6} = \frac{35}{4} - \frac{47}{6} = \frac{11}{12} \\ 2 \frac{5}{8} - 1 \frac{3}{10} = (2 - 1)( \frac{5}{8} - \frac{3}{10} ) = 1 + \frac{13}{40} = 1 \frac{13}{40} \\ 8 \frac{19}{20} - 3 \frac{20}{21} = \frac{179}{20} - \frac{83}{21} = \frac{2099}{420} = 4 \frac{419}{420}$