Question

решите пример:8 целых 3/17 умножить на 5 целых 1/4 + 3 целых 14/17 умножить на 5 целых 1/4

Answer 1

$8 \frac{3}{17} \times 5 \frac{1}{4} + 3 \frac{14}{17} \times 5 \frac{1}{4} = 63$
$8 \frac{3}{17} \times 5 \frac{1}{4} = \frac{139}{17} \times \frac{21}{4 } = \frac{2919}{68} = \\ 42 \frac{63}{68}$
$3 \frac{14}{17} \times 5 \frac{1}{4} = \frac{65}{17} \times \frac{21}{4} = \frac{1365}{68} = \\ 20 \frac{5}{68}$
$42 \frac{63}{68} + 20 \frac{5}{68} = 62 \frac{68}{68} = 63$