473.............СРОЧНО

Question

473.............СРОЧНО

---

Answer 1

А)1/4+1/3=(3+4)/12=7/12
б)1/5+1/4=(4+5)/20=9/20
в)1/6+1/5=(5+6)/30=11/30
г)1/7+1/3=(3+7)/28=10/28