Question

Simplifique as frações 2/5 + 3/10

Answer 1

2/5+3/10
2/5=4/10
4+3=7
7/10

Answer 2

2/5 + 3/10               ( mmc de 5 e 10 = 10 ) 

10/5 = 2
2.2 = 4 

10/10 = 1
1.3 = 3 

agora tenho ... 

4/10 + 3/10 = 7/10                 ok