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b) -8,1/6 + 2,4/6 = -6,3/6
c) 4,6/8 - 1,7/8 = 2,7/8
d) 4,8/18 - 1,15/18 = 2,11/18
e) 40/9 * (- 27/8) = 5/1 * (- 3/1) = -15
f) -26/3 : (-13/9) = -26/3 * (-9/13) = -2/1 * (- 3/1) = 6
g) -6,1/2 - 8/3 * (- 9/2) = -6,1/2 - 4/1 * (- 3/1) = -6,1/2 + 12 = 5,1/2
h) -50/9 : (-4,1/6) = -50/9 : (- 25/6) = -50/9 * (- 6/25) = -2/3 * (-2/1) = 4/3