3. Найдите значение выражения: 1)-42+75+(-14)+(-26) + 56; 2) 12+(-20)-(-11)-(-6)- 10; 3) 3\(\frac{5}{12}\) - (-\(\frac{1}{3}\)) + (-\(\frac{4}{8}\)).

Ответ: 1) 49; 2) -1; 3) 3\(\frac{1}{12}\)

1. -42 + 75 + (-14) + (-26) + 56 = 33 - 14 - 26 + 56 = 19 - 26 + 56 = -7 + 56 = 49
2. 12 + (-20) - (-11) - (-6) - 10 = 12 - 20 + 11 + 6 - 10 = -8 + 11 + 6 - 10 = 3 + 6 - 10 = 9 - 10 = -1
3. 3\(\frac{5}{12}\) - (-\(\frac{1}{3}\)) + (-\(\frac{4}{8}\)) = \(\frac{41}{12}\) + \(\frac{1}{3}\) - \(\frac{1}{2}\) = \(\frac{41}{12}\) + \(\frac{4}{12}\) - \(\frac{6}{12}\) = \(\frac{45}{12}\) - \(\frac{6}{12}\) = \(\frac{39}{12}\) = 3\(\frac{3}{12}\) = 3\(\frac{1}{4}\)

Ответ: 1) 49; 2) -1; 3) 3\(\frac{1}{4}\)