\[ 2,69 + 4,01 = 6,70 \]
\[ 61,35 - 49,561 = 11,789 \]
\[ 11,789 - 6,70 = 5,089 \]
\[ 0,72 + 81 = 81,72 \]
\[ 81,72 - 3,968 = 77,752 \]
\[ 1000 + 77,752 = 1077,752 \]
Ответ: 5,089; 1077,752