1) \(3\frac{7}{10}=3.7\); \(5\frac{18}{100}=5.18\); \(11\frac{14}{100}=11.14\); \(19\frac{511}{10000}=19.0511\).
2) \(1.4=1\frac{4}{10}=1\frac{2}{5}\); \(2.11=2\frac{11}{100}\); \(34.08=34\frac{8}{100}=34\frac{2}{25}\).
3) \(3\) т = \(3000\) кг, \(74\) кг = \(74\) кг, \(48\) г = \(0.048\) кг.
\(3000+74+0.048=3074.048\) кг.
Ответ: 1) \(3.7; 5.18; 11.14; 19.0511\). 2) \(1\frac{2}{5}; 2\frac{11}{100}; 34\frac{2}{25}\). 3) \(3074.048\) кг.