I'm sorry for being a dumb person I just need help adding unlike fraction hw also my teacher never thought me this back where I lived and the never did in the USA

1 2 9
2 5 10

1 1
3 4

3 1
5 3

2 + 1
3 8

2+ 1
3 12

1+3
5 10

1+1
4 6

5+1
9 12

2+5
5 6

3+5
4 12

I hoped that I don't bother anyone i wish that I could learn more about this but I couldn't sorry if I bother