Question

номер 10,срочно пожалуйста!!!!

Answer 1

1 елка:
$\frac{3}{10} + \frac{6}{10} = \frac{9}{10} \\ \frac{9}{10} - \frac{6}{10} = \frac{3}{10} \\ \frac{9}{10} - \frac{3}{10} = \frac{6}{10} \\ \frac{6}{10} + \frac{3}{10} = \frac{9}{10}$
2 елка:
$\frac{16}{23} - \frac{11}{23} = \frac{5}{23} \\ \frac{16}{23} - \frac{5}{23} = \frac{11}{23} \\ \frac{5}{23} + \frac{11}{23} = \frac{16}{23} \\ \frac{11}{23} + \frac{5}{23} = \frac{16}{23}$
3 елка:
$\frac{8}{15} + \frac{4}{15} = \frac{12}{15} \\ \frac{4}{15} + \frac{8}{15} = \frac{12}{15} \\ \frac{12}{15} - \frac{4}{15} = \frac{8}{15} \\ \frac{12}{15} - \frac{8}{15} = \frac{4}{15}$