Запишите числа -7, -3.2, -0.8, 9, 0 , 21, 7 в виде дроби со знаменателем 1, 3, 10, 1000,...

Решите задачу:

$\displaystyle -7=- \frac{7}{1}=- \frac{21}{3}=- \frac{70}{10}=- \frac{7000}{1000} \\ \\ -3,2=-\frac{3,2}{1}=-\frac{9,6}{3}=-\frac{32}{10}=-\frac{3200}{1000}\\\\-0,8=- \frac{0,8}{1}=-\frac{2,4}{3}=-\frac{8}{10}=-\frac{800}{1000}\\\\9=\frac{9}{1}=\frac{27}{3}=\frac{90}{10}=\frac{9000}{1000}\\\\0=\frac{0}{1}=\frac{0}{3}=\frac{0}{10}=\frac{0}{1000}\\\\21=\frac{21}{1}=\frac{63}{3}=\frac{210}{10}=\frac{21000}{1000}\\\\7=\frac{7}{1}=\frac{21}{3}=\frac{70}{10}= \frac{7000}{1000}$