Question

Помогите пожалуйста решить

Answer 1

1)
$frac{18}{57} = frac{6 times 3}{19 times 3} = frac{6}{19}$
$frac{13}{39} = frac{13}{13 times 3} = frac{1}{3}$
$frac{81}{270} = frac{27 times 3}{27 times 10} = frac{3}{10}$
2)
$frac{7}{3} + frac{7}{8} = frac{7 times 8}{24} + frac{7 times 3}{24} = frac{56}{24} + frac{21}{24} = frac{77}{24}$
3)
$frac{5}{18} - frac{11}{60} = frac{5 times 10}{180} - frac{11 times 3}{180} = frac{50}{180} - frac{33}{180} = frac{17}{180}$
4)
$frac{4}{7} + frac{2}{21} = frac{4 times 3}{21} + frac{2}{21} = frac{12}{21} + frac{2}{21} = frac{14}{21} = frac{2}{3}$
5)
$frac{49}{75} : : frac{2}{3} \ frac{49}{75} : : frac{2 times 25}{75} \ frac{49}{75} < frac{50}{75}$
6)
$frac{1}{7} + frac{2}{35} - frac{1}{5} = frac{5}{35} + frac{2}{35} - frac{7}{35} = frac{5 + 2 - 7}{35} = frac{1}{35}$