176. Решение:
1) 37 + (−50) + 22 + 13 + (−28) = 37 - 50 + 22 + 13 - 28 = (37 + 22 + 13) + (-50 - 28) = 72 - 78 = -6
2) -1,32 + 2,41 + 3,77 + (-4,68) + 0,59 = -1,32 + 2,41 + 3,77 - 4,68 + 0,59 = (-1,32 - 4,68) + (2,41 + 3,77 + 0,59) = -6 + 6,77 = 0,77
3) 16/25 + 4/27 + 21/25 - 13/27 = (16/25 + 21/25) + (4/27 - 13/27) = 37/25 + (-9/27) = 37/25 - 1/3 = (111 - 25)/75 = 86/75 = 1 11/75