Question

Обчислити вираз 2 3/5+1 3/5
7-3 2/7
2 5/9-1 7/9
(3 2/4+1 2/4)-(3 2/7-1 5/7)

Answer 1

Пошаговое объяснение:

$2 \frac{3}{5} + 1 \frac{3}{5} = (2 + 1) + ( \frac{3}{5} + \frac{3}{5} ) = 3 + \frac{6}{5} = 3 + 1 + \frac{1}{5} = 4 \frac{1}{5}$

$7 - 3 \frac{2}{7} = 6 + 1 - 3 - \frac{2}{7} = (6 - 3) + ( \frac{7}{7} - \frac{2}{7} ) = 3 + \frac{5}{7} = 3 \frac{5}{7}$

$2 \frac{5}{9} - 1 \frac{7}{9} = (2 - 1) + (\frac{5}{9} - \frac{7}{9} ) = \frac{9}{9} + \frac{5}{9} - \frac{7}{9} = \frac{7}{9}$

$(3 \frac{2}{4} + 1 \frac{2}{4} ) - (3 \frac{2}{7} - 1 \frac{5}{7} ) = 4 \frac{4}{4} - (2 + \frac{9}{7} - 1 - \frac{5}{7} ) = 5 - 1 - \frac{4}{7} = 4 - \frac{4}{7} = 3 + \frac{7}{7} - \frac{4}{7} = 3 \frac{3}{7}$