Question

1) 30-15 9/10-12 3/10 2) 49-19 3/5-2 2/5​

Answer 1

Переводим смешанные дроби в неправильные:

1. $30 - 15\frac{9}{10} - 12\frac{3}{10} = 1,8$

2. $49 - 19\frac{3}{5} - 2\frac{2}{5} = 27$

1. $30 - \frac{159}{10} - \frac{123}{10} = 1,8$

1) $\frac{30}{1} - \frac{159}{10} = \frac{300}{10} - \frac{159}{10} = \frac{141}{10}$

2) $\frac{141}{10} - \frac{123}{10} = \frac{18}{10} = 1,8$

2. $49 - \frac{98}{5} - \frac{12}{5} = 27$

1) $\frac{49}{1} - \frac{98}{5} = \frac{245}{5} - \frac{98}{5} = \frac{147}{5}$

2) $\frac{147}{5} - \frac{12}{5} = \frac{135}{5} = 27$

Answer 2

Ответ:

1. 1 4/5

2. 27

Пошаговое объяснение:

1) 30 - 15 9/10 - 12 3/10 = 29 10/10 - 15 9/10 - 12 3/10 = 14 1/10 - 12 3/10 =

13 11/10 - 12 3/10 = 1 8/10 = 1 4/5

2) 49 - 19 3/5 - 2 2/5​ = 48 5/5 - 19 3/5 - 2 2/5​ = 29 2/5 - 2 2/5 = 27