Question

Scrieți elementele mulțimilor:c) C={x€N|75≤3x^2≤300}
dau coroana.

Answer 1

C={x∈N|25≤x²≤100}
C={5;6;7;8;9;10}
as simple as that!!!!

Answer 2

75 ≤ 3x² ≤ 300 /:3
25 ≤ x² ≤ 100
√25 ≤ x √100
5 ≤ x ≤ 10

x € [5;10] → x = {5;6;7;8;9;10}.


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