Question

calcule o resultado de cada fração a)4/15+5/20-1/30-1/10 b) 8/18+3/27-1/9+1/6 c) 3/12+3/24+3/20-1/9 d)4/15+3/12-3/10+3/8 e) 10/15+8/10-3/25+1/5

Answer 1

a) 4/15 + 5/20 - 1/30 - 1/10 ==> mmc = 60

16+15-2-6/60

23/60

b) 8/18 + 3/27 - 1/9 + 1/6==>mmc = 54

24+6-6+9/54

33/54 ÷ 3 =

11/18

c) 3/12 + 3/24 + 3/20 - 1/9==>mmc = 360

90+45+54-40/360

149/360

d) 4/15 + 3/12 - 3/10 + 3/8==>mmc = 120

32+30-36+45/120

71/120

e) 10/15 + 8/10 - 3/25 + 1/5==>mmc = 75

50 + 60 - 9 + 15/75

116/75

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