Дам 20 балов -2/5-(-3/5) ; -3/7-(+4/7) ; 1/9-(+2/9)

Question

Дам 20 балов -2/5-(-3/5) ; -3/7-(+4/7) ; 1/9-(+2/9)

---

Answer 1

1) -2/5+3/5=1/5
2)-3/7-4/7=-7/7=-1
3)1/9-2/9=-1/9