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b) -10 - 7 - (-7) - 18 = -10 - 7 + 7 - 18 = -28
c) -5/9 + 2/3 + 5/9 - 5/6 - 2/3 = - 5/6
d) -2/7 + 3/8 - 1/2 + 2/7 - 1/4 + 1/2 = 3/8 - 1/4 = 3/8 - 2/8 = 1/8
e) -1,1 + 2,2 + 3,3 - 5,5 + 6,6 = 5,5
f) -3,7 + 2,85 + 4,7 - 4,85 = - 1
g) 1 i 1/4 - 0,5 - 3/7 - 0,25 + 1 i 1/2 = 5/4 - 2/4 - 3/7 - 1/4 + 6/4 = 8/4 - 3/7 = 56/28 - 12/28 = 44/28 = 1 16/28 = 1 4/7
h) -1/8 - 1/3 + 2,5 + 3 i 1/3 - (-0,125) =-1/8 - 1/3 + 25/10 + 10/3 + 1/8 = -15/120 - 40/120 + 300/120 + 400/120 + 15/120 = 660/120 = 5 1/2