Решение:
\[ 12,07 + 5,453 + 4,007 - 5,6402 = 17,523 + 4,007 - 5,6402 = 21,53 - 5,6402 = 15,8898 \]
\[ (10,2 - 6,001 + 5,028) - (9,5 - 8,632 - 0,72) \]
\[ (4,199 + 5,028) - (0,868 - 0,72) \]
\[ 9,227 - 0,148 = 9,079 \]
\[ 537,6 - (349,2 + 14,076 - 23,56) \]
\[ 537,6 - (363,276 - 23,56) \]
\[ 537,6 - 339,716 = 197,884 \]
Ответ: 1) 15,8898; 2) 9,079; 3) 197,884.