Question

Calcule(fração)as adições e subtrações das seguintes frações.

A)5\2+3\4= B)3\2+7\3= C)6\8+3\2= D)9\3+1\4= E)12\6+3\8= F)6\5-2\3-1\3=
G)7\3+3\4-2\4=

COLOQUEM CÁLCULOS!!!

Answer 1

a) 5/2 + 3/4 = (MMC = 8)
   4.5/8 + 2.3/8 = 20/8 + 6/8 = 26/8 (/2) = 13/4

b) 3/2 + 7/3 = (MMC = 6)
   3.3/6 + 2.7/6 = 9/6 + 14/6 = 23/6

c) 6/8 + 3/2 = (MMC = 8)
   1.6/8 + 4.2/8 = 6/8 + 8/8 = 14/8 (÷2) = 7/4

d) 9/3 + 1/4 = (MMC = 12)
   4.9/12 + 3.1/12 = 36/12 + 3/12 = 39/12 = (÷3) =13/4

e) 12/6 + 3/8 =

12/6 = 2/1

2/1 + 3/8 = (MMC = 8)
8.2/8 + 1.3/8 = 16/8 + 3/8 = 19/8

f) 6/5 - 2/3 - 1/3 = (MMC = 15)

  3.6/15 - 5.2/15 - 5.1/15 = 18/15 - 10/15 - 5/15 = (18 - 10 - 5)/15 = 3/15 (÷3) = 1/5

g) 7/3 + 3/4 - 2/4 = 7/3 + (3/4 - 2/4) = 7/3 + 1/4 = (MMC = 12)

   4.7/12 + 3.1/12 = 28/12 + 3/12 = 31/12