a) 0 + (+66) = 0 + 66 = 66
б) +27 + (-27) = 27 - 27 = 0
в) (+7) + (-93) = 7 - 93 = -86
г) 17 + (-1) = 17 - 1 = 16
д) (-87) + 0 = -87
е) -48 + 52 = 4
ж) (-6) + (-94) = -6 - 94 = -100
з) -29 + (+29) = -29 + 29 = 0
и) +44 + 44 = 88
к) (-37) + (-37) = -37 - 37 = -74
а) 45 - (-23) = 45 + 23 = 68
б) 26 - 39 = -13
в) -39,8 - (-23,5) = -39,8 + 23,5 = -16,3
г) -14,7 - 17,4 = -32,1
д) \[\frac{3}{7} - 4 = \frac{3}{7} - \frac{28}{7} = \frac{3 - 28}{7} = \frac{-25}{7} = -3\frac{4}{7}\]
е) \[-\frac{11}{12} - (-\frac{8}{9}) = -\frac{11}{12} + \frac{8}{9} = -\frac{11 \cdot 3}{12 \cdot 3} + \frac{8 \cdot 4}{9 \cdot 4} = -\frac{33}{36} + \frac{32}{36} = \frac{-33 + 32}{36} = -\frac{1}{36}\]
ж) \[-5\frac{3}{28} + 4\frac{5}{12} = -5\frac{3 \cdot 3}{28 \cdot 3} + 4\frac{5 \cdot 7}{12 \cdot 7} = -5\frac{9}{84} + 4\frac{35}{84} = -5 + 4 + \frac{-9 + 35}{84} = -1 + \frac{26}{84} = -1 + \frac{13}{42} = -\frac{42}{42} + \frac{13}{42} = \frac{-42 + 13}{42} = -\frac{29}{42}\]
з) \[-3\frac{7}{12} - 2\frac{5}{8} = -3\frac{7 \cdot 2}{12 \cdot 2} - 2\frac{5 \cdot 3}{8 \cdot 3} = -3\frac{14}{24} - 2\frac{15}{24} = -3 - 2 - \frac{14}{24} - \frac{15}{24} = -5 - \frac{14 + 15}{24} = -5 - \frac{29}{24} = -5 - 1\frac{5}{24} = -6\frac{5}{24}\]
Ответ: См. решение