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b) 109/100 + 72/10 : 8/5 = 109/100 + 72/10 * 5/8 = 109/100 + = 9/2 = 4 i 1/2
c) 1/2 * 1/2 + 1/5 * 6/5 = 1/4 + 6/25 = 25/100 + 24/100 = 49/100
d) 0,9 * (3/8 + 1/8) = 9/10 * 4/8 = 36/80 = 18/40 = 9/20