Question

Помогите решить тест, и решения нужно тоже писать.

Answer 1

1)

$2 \frac{4}{13} = \frac{26 + 4}{13} = \frac{30}{13}$

2)

$4 \frac{2}{3} \times \frac{2}{5} = \frac{14}{3} \times \frac{2}{5} = \frac{28}{15} = 1 \frac{13}{15}$

3)

$(3 \frac{12}{17} + 4 \frac{5}{21} ) - 1 \frac{12}{17} = (7 + \frac{337}{357}) - \frac{29}{17} = \frac{2836}{357} - \frac{29}{17 } = \frac{131}{21} = 6 \frac{5}{21}$

4)

$x + \frac{3}{5} + \frac{7}{8} = 2 \frac{3}{8} \\ x + \frac{59}{40} = \frac{19}{8} \\ x = \frac{19}{8} - \frac{59}{40} \\ x = \frac{9}{10}$

5)

$x + 4 \frac{3}{8} = 12 \frac{1}{2} \\ x + \frac{35}{8} = \frac{25}{2} \\ x = \frac{25}{2} - \frac{35}{8} \\ x = \frac{65}{8} = 8 \frac{1}{8}$