1) -42 + 75 + (-14) + (-26) + 56 = -42 + 75 - 14 - 26 + 56 = 49
2) 12 + (-20) - (-11) - (-6) – 10 = 12 - 20 + 11 + 6 - 10 = -1
3) 3 5/12 - (-1 1/3) + (-4 3/8) = 3 5/12 + 1 1/3 - 4 3/8 = 3 5/12 + 1 4/12 - 4 9/24 = 4 9/12 - 4 9/24 = 4 18/24 - 4 9/24 = 9/24 = 3/8
Ответ:
1) 49
2) -1
3) 3/8