Question

Найти значение выражения:
1)1 4/15+6 13/45-7/12;
2)10 5/28+ (6/7-3/14);
3)8 7/12-5/18+1 3/4-2 1/6

Answer 1

1)
$1 \frac{4}{15} + 6 \frac{13}{45} - \frac{7}{12} = \\ \\ = 1 \frac{12}{45} + 6 \frac{13}{45} - \frac{7}{12} = \\ \\ = 7 \frac{5}{9} - \frac{7}{12} = \\ \\ = 7 \frac{20}{36} - \frac{21}{36} = 6 \frac{56}{36} - \frac{21}{36} = \\ \\ = 6 \frac{35}{36}$

2)
$10 \frac{5}{28} + ( \frac{12}{14} - \frac{3}{14} ) = \\ \\ = 10 \frac{5}{28} + \frac{18}{28} = \\ \\ = 10 \frac{23}{28}$

3)
$8 \frac{21}{36} - \frac{10}{36} + 1 \frac{27}{36} - 2 \frac{6}{36} = \\ \\ = 8 \frac{11}{36} + 1 \frac{27}{36} - 2 \frac{6}{36} = \\ \\ = 9 \frac{38}{36} - 2 \frac{6}{36} = 7 \frac{32}{36} = 7 \frac{8}{9}$