Question

Calcule as operações com frações:

a) 7/13 + 2/13=?
b) 8/15 - 2/15=?
c) 11/6 + 1/6 + 5/6=?
d) 1/3 + 2/5=?
e) 7/12 + 5/18=?
f) 1/2 - 1/3 + 5/6 - 3/4=?
g) 2 - 7/6 + 3/4=?
h) 2/3 . 1/4 . 8/5=?
i) 18/12 . 2/28 . 22/9=?

Answer 1

a) 7/13 + 2/13= 9/13

b) 8/15 - 2/15= 6/15 simplificando por 3 = 2/5

c) 11/6 + 1/6 + 5/6= 17/6
d) 1/3 + 2/5 .. mmc:(3,5)= 15
5/15+6/15= 11/15

e) 7/12 + 5/18 .. mmc:(12,18)= 36
21/36+10/36= 31/36

f) 1/2 - 1/3 + 5/6 - 3/4 ... mmc:(2,3,6,4)= 12
6/12-4/12+10/12-9/12= 3/12 simplificando por 3 = 1/4

g) 2 - 7/6 + 3/4.. mmc:(1,6,4)= 12
24/12-14/12+9/12= 19/12

h) 2/3 . 1/4 . 8/5= 16/60 simplificando por 4 = 4/15

i) 18/12 . 2/28 . 22/9= 792/3024 simplificando por 64= 11/42