3. 1) (6,72 : \(\frac{3}{5}\) + 1\(\frac{1}{8}\) \(\cdot\) 0,8) : 1,21 – 6\(\frac{3}{8}\) 2) 3,075 : 1,5 – \(\frac{1}{4}\) \(\cdot\) (\(\frac{1}{25}\) + 3,26) 3) 3\(\frac{3}{4}\) \(\cdot\) 1\(\frac{1}{5}\) + (2,55 + 2,7) : (0,1 – \(\frac{1}{80}\)) 4) (3,6 \(\cdot\) \(\frac{1}{20}\) – 24 : 200) : 1\(\frac{1}{5}\) + 1\(\frac{1}{4}\) \(\cdot\) 0,2

Ответ: -5,0625

1) 6,72 : \(\frac{3}{5}\) = 6,72 \(\cdot\) \(\frac{5}{3}\) = \(\frac{672}{100}\) \(\cdot\) \(\frac{5}{3}\) = \(\frac{3360}{300}\) = 11,2

2) 1\(\frac{1}{8}\) \(\cdot\) 0,8 = \(\frac{9}{8}\) \(\cdot\) \(\frac{8}{10}\) = \(\frac{72}{80}\) = 0,9

3) 11,2 + 0,9 = 12,1

4) 12,1 : 1,21 = 10

5) 6\(\frac{3}{8}\) = \(\frac{51}{8}\) = 6,375

6) 10 - 6,375 = 3,625

Ответ: 3,625