Решение:
1) \(-36 + 69 + (-17) + (-42) + 32 = -36 + 69 - 17 - 42 + 32 = 6\)
2) \(-8 - (-12) - (-7) + 12 - 20 = -8 + 12 + 7 + 12 - 20 = 3\)
3) \(2\frac{3}{4} - (-\frac{1}{2}) + (-\frac{5}{6}) = \frac{11}{4} + \frac{1}{2} - \frac{5}{6} = \frac{33}{12} + \frac{6}{12} - \frac{10}{12} = \frac{33 + 6 - 10}{12} = \frac{29}{12} = 2\frac{5}{12}\)
Ответы:
1) 6
2) 3
3) \(2\frac{5}{12}\)