Question

resolva as operacoes: 2/5+3/4

Answer 1

2/5 + 3/4
= (2 x 4)/(5 x 4) + (3 x 5)/(4 x 5)
= 8/20 + 15/20
= 23/20

Answer 2

2 + 3  =   4.2 + 5.3  =  8 + 15  =   23
5    4            20              20          20

mmc (4,5) = 20

5,4: 2
5,2: 2
5,1: 5
1,1   = 2.2.5 = 4.5 = 20