3. Вычислите: 1) | -4,51 + |-7,9| – 11,55|; 2) |-12/24| : |1-2 1/12|.

Решение:

1. \( | -4,51 + |-7,9| – 11,55| = |-4,51 + 7,9 - 11,55| = |3,39 - 11,55| = |-8,16| = 8,16 \)
2. \( |-\frac{12}{24}| : |1-2\frac{1}{12}| = |-\frac{1}{2}| : |-\frac{13}{12}| = \frac{1}{2} : \frac{13}{12} = \frac{1}{2} \cdot \frac{12}{13} = \frac{6}{13} \)

Ответ: 1) 8,16; 2) 6/13