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(39 . 42 - 37 . 42) : 42

= 42 . (39 - 37)

= 42 . 2

= 84

= 84 : 42

= 2

a) 5,84 > 5,48 b) 24,8 = 24,800

29,1230 = 29,123 15,03 < 15,038

62,17 < 63,98 21,27 < 32,71

b) 156 - (X + 61) = 82

X + 61 = 156 - 82

X + 61 = 74

X = 74 - 61

X = 13

a) (X - 25) - 120 = 3

X - 25 = 120 - 3

X - 25 = 123

X = 123 + 25

X = 148