Question

adição e subtração de frações
a) 1.1/4 + 1. 1/6
b) 1.1/3 - 8/9
c) 3/46 +11/69

Answer 1

a)
1*(1/4)+1*(1/6)=
1/4 + 1/6
MMC entre 4,6=24
[(24/4)*1 + (24/6)*1]/24=
[6*1 + 4*1]/24=
[6+4]/24=
10/24 ou 5/12

b)
1*(1/3)-(8/9)
1/3 - 8/9
mmc entre 3,9=9
[(9/3)*1 - (9/9)*8]/9=
[3*1 - 1*8]/9=
[3-8]/9=
-5/9

c)
(3/46) + (11/69)
mmc entre 46,69=
46,69|2
23,69|3
23,23|23
1,1

2*3*23=
6*23=
138

[(138/46)*3+(138/69)*11]/138
[3*3+2*11]/138
[9+22]/138
31/138