a) -3 : 9/10 + (-1/5) : 2/5
b) -2 : 3/5- (-3/5) : 2 - 1,1/2 : 6 - 6 : (-1,1/2)
c) 5,1/2 : (1,1/2 - 2/5) + (1/6 : 3/4) : 19/24
D) (- 5/7 * 2,1/3 * 5/6 - 1) : [ 1 - (- 7/8) * (-1,3/4) * 3/14]
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a) =-10/3 + (-1/2) = -20/6 + (-3/6) = -23/6 = 3,5/6
b) = -10/3 + 3/10 - 1/4 + 1/9 = 100/30 + 9/30 - 9/36 + 4/36 = 109/30