37) 4/3 — 1/3 (4 + 3/4) = — 1/4

38) 3/2 + 1/2 (1 + 2/3) = 7/3

39) 4/3 — 3/2 ( 1 + 1/2) = — 11/12

40) 4/5 — 4/5 (1 + 3/4) = — 3/5

41) 6/5 — 1/5 (1 + 5/6) = 5/6

42) 5/4 — 1/4 (2 + 4/5) = 11/20

43) (2 — 4/5) : 0,8 = 3/2

44) (0,5 — 2/3) : 7/3 = — 1/4

45) (4 — 2 1/2) : 0,5 = 3

46) (0,7 + 2/3) · 3/7 = 41/70

47) (0,4 + 3/5) : 2 1/5 = 5/11

48) (0,5 — 1 1/2) : 1 1/4 = — 4/5

49) (2,5 + 2/3) : (1,5 — 2/3) = 38/5

50) (4/5 + 2 1/4) : (1/2 — 3/4) = — 61/5

51) (2 1/2 + 0,2) : (1 1/2 — 0,1) = 27/14

52) (1 1/5 + 0,5) : (1 1/2 — 0,2) = 17/13

53)|3 2/3 — 3 · 1,2| = 1/15

54)|4 2/5 — 2 · 1,6| = 6/5

71. 5 + (-5) = 0

72. 6 + (-6) = 0

73. 8 — (-8) = -16

74. 4 — (-4) = -8

75. 3 · (-3) = -9

76. 2 · (-2) = -4

77. 12 : (-12) = -1

78. 14 : (-14) = -1

79. 13 — 10 = 3 = -3

80. 15 — 9 = 6 = -6

81. 20 — (-4) = 24 = -24

82. 10 — (-4) = 14 = -14

83. 7 — (-3) = -4 = 4

84. 5 + (-34) = -29 = 29