Ifodaning eng kichik qiymatini toping

1. 
   Agar bo`lsa, ifodaning eng kichik qiymatini toping.
   
2. 
   To`rtta sonning yig`indisi 270 ga teng. Ulardan dastlabki uchtasi 4, 5 va 11 sonlariga to`g`ri proporsional, ikkinchi va to`rtinchi sonlar esa 7 va 5 sonlariga teskari proporsional. Uchinchi sonni toping.
   
3. 
   Agar bo`lsa, ning qiymatini toping.
   
4. 
   
   

ifodani soddalashtiring.

5. 
   tenglamaning ildizlari yig`indisini toping.