Am nevoie urgent de un răspuns Varog
![Am Nevoie Urgent De Un Răspuns Varog class=](https://ro-static.z-dn.net/files/d1b/cd91b90cc6c30bc63b3d49fa7f4a6a1f.jpg)
Răspuns:
3)15/7+3/14-7/21=90/42+9/42-14/42=85/42
4)13/12-5/20=65/60-15/60=40/60
5)3/50-7/25=3/50-14/50=-11/50