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16. (0,7 x 0/29) : (3,6 + 4,375 - 1,75) = 0,02
17. 2,5 : 0,7 : 0.5 x 4,5 - 1.6 = 30,54
19. (0,71 x 1,5) - (5,6 x 0,5) = 1,735
20. 8,8 - 2 : 1,5 x 1,8 = 6,4