Question

Efetue as operações:

a) 2/3 + 1/2 - 3/5 =
b) 1/2 - 1/4 - 1/6 =
c) 1/4 - 1/2 - 1/8 =
d) 3 + 1/3 - 1/2 = 
e) 1 - 4/3 + 5/2 =
f) 2 + 1/2 + 1/3 - 1/4 =
g) 3/5 + 2/3 + 1 - 1/6 =
h) 1/2 - 1/4 - 1/8 - 3 =
i) 4 - 2/3 + 1/2 - 2/5 =
j) 3/2 - 1/3 + 1/6 - 1/9 =
k) 4/5 - 1/2 + 1/3 - 1/4 =

EX.: a) 1/10 - 1/2 + 1/5 = 1-5+2/10 = -2/10 = -1/5

Answer 1

a) 2/3 + 1/2 - 3/5 =  (20 + 15 - 18)/30 ==> 27/30
    mmc=30

b) 1/2 - 1/4 - 1/6 = (6-3-2)/12 ==> 1/12
      mmc= 12

c) 1/4 - 1/2 - 1/8 = (2-4-1)/8 ==> - 3/8
      mmc= 8

d) 3 + 1/3 - 1/2 =    (18+2-3)/6 ==> 17/6
    mmc=6

e) 1 - 4/3 + 5/2 = (6-8+15)/6 ==> 13/6
   mmc=6

f) 2 + 1/2 + 1/3 - 1/4 = (24+6+4-3)/12 ==> 31/12
  mmc=12

g) 3/5 + 2/3 + 1 - 1/6 = (18+20+30-5)/30 ==> 63/30
   mmc=30

h) 1/2 - 1/4 - 1/8 - 3 = (4-2-1-24)/24 ==> - 23/24
   mmc=8

i) 4 - 2/3 + 1/2 - 2/5 = (120-20+15-12)/30 ==> 103/30
    mmc=30

j) 3/2 - 1/3 + 1/6 - 1/9 = (27-6+3-2)/18 ==> 22/18
   mmc= 18

k) 4/5 - 1/2 + 1/3 - 1/4 = ( 48-30+20-15)/60 ==> 23/60
     mmc=60