1) o resultado da soma das frações: (8/15)+(80/15), é: a) 88/30 b) 88/15 c) 72/15 d) 72/30 2) o resultado da subtração das frações: (7/5)-(1/5) a) 6/5 b) 6 c) 8/10 d) 8/5 3) a soma das frações: (2/5)+(5/12), é: a) 7/5 b) 7/17 c) 49/60 d) 49/12 4) (1/2)-(1/4) a) 1/2 b) 2 c) -1/4 d) 1/4 5) (2/3)*(1/3) a) 2/3 b) 2/6 c) 2/9 d) 3/6 6) (1/4)*(8/9) a) 4/36 b) 2/9 c) 8/19 d) 1/5 7) (9/5) / (8/6) a) 27/20 b) 1 c) 72/30 d) 54/5 8) (2/8)*(5/6) a) 12/40 b) 10/48 c) 12/6 d) 10/8 9) (8/15) / (2/15) a) 4/15 b) 16/15 c) 16 d) 4 10) (1/5)-1 a) 1/4 b) 5 c) -4/5 d) -1/4

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