Question

ajuroooooorrrrr
 
C∈{x∈Z|75≤3x²≤300}

Answer 1

C∈{x∈Z|75≤3x²≤300}
75≤3x²≤300}  l :3
25≤x²≤100 (scoatem radicalul de peste tot)
5≤x≤10

x∈[5,10]
x=5,6,7,8,9,10