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12/5 + 1/3 - 3/20 =
(144 + 20 - 9 )/60 =
= 155/60
= 2,58
B) 3/2 - 16/100
= 3/2 - 4/25
= (75 - 8)/50
= (67/50)
= 1,34
C) 8/10 + 2/9 - 5/100
= 4/5 + 2/9 - 1/20
= (144 + 40 - 9) /180
= 175 / 180
= 0,97