3) 2 1/2 * 48 - 3 2/3 : 1/18 + 5 5/12 : 7/36

Решение:

• 1) 2 \(\frac{1}{2}\) = \(\frac{5}{2}\)
• 2) \(\frac{5}{2}\) \(\times\) 48 = 5 \(\times\) 24 = 120
• 3) 3 \(\frac{2}{3}\) = \(\frac{11}{3}\)
• 4) \(\frac{11}{3}\) : \(\frac{1}{18}\) = \(\frac{11}{3}\) \(\times\) 18 = 11 \(\times\) 6 = 66
• 5) 5 \(\frac{5}{12}\) = \(\frac{65}{12}\)
• 6) \(\frac{65}{12}\) : \(\frac{7}{36}\) = \(\frac{65}{12}\) \(\times\) \(\frac{36}{7}\) = 65 \(\times\) \(\frac{3}{7}\) = \(\frac{195}{7}\)
• 7) 120 - 66 = 54
• 8) 54 + \(\frac{195}{7}\) = \(\frac{54 \times 7 + 195}{7}\) = \(\frac{378 + 195}{7}\) = \(\frac{573}{7}\)

Ответ: \(\frac{573}{7}\)