Question

2- Determine o valor das frações:

a) 1 + 1
--- --- =
3 3

b) 9 + 5
--- --- =
10 2

c) 1 - 1
--- --- =
4 6

d) 7 - 1
--- --- =
12 5

Answer 1

a) 1/3 + 1/3 = 2/3


b) 9/10 + 5/2 =          mmc = 10
    10:10.9 + 10:2.5 / 10 =
          9     +     25 /10 = 
                        34/10


c) 1/4 - 1/6 =                mmc = 12
    12:4x1 - 12:6.1 / 12 =
         3     -     2 / 12 =
         1/12


d) 7/12 - 1/5 =             mmc = 60
    60:12x7 - 60:5x1 / 60 =
        5 x 7  -  12 x 1 / 60 =
          35    -    12    / 60 =
                        23 / 60