Do you have a typo in number 1?
Your other answers are right.
1. 1/6+5/7=6/7
2. 3/10+3/10=3/5
3. 2/9+(-4/9)=-2/9
5 answers
1. 1/7+5/7=6/7. Yes, it was a typo.
Right.
Thanks.
You're welcome.