Explanation:
1) - 5/4 plus 4/5
- 5/4 + 4/5
Just make the bottom number the same ( and remember everything u do to the bottom must be done to the top
- 5 4
--- + - - -
4 5
- 5×5 4×4
--- + - - -
4×5 5×4
-25 16
---- + - - - -
20 20
-9
----
20
= - 9/20
The others are the same, try it yourself, i can help u check, cuz it is hard for me to type here