Question

МАТЕМАТИКА!! СРОЧНО!!!​

Answer 1

Ответ:

2. c)

3. b)

4. а) $\frac{8:2}{22:2} = \frac{4}{11}$

   б) $\frac{70:10}{100:10} = \frac{7}{10} = 0,7$

5.

$(45 - y) + 18 = 58\\45 - y + 18 = 58\\63 - y = 58\\-y = 58-63\\-y = -5 \\y = 5$

Проверка:

$(45 - 5) + 18 = 58\\40 + 18 = 58\\58 = 58$