Question

elementele mutimii a={x€N |2x+3 <9} sunt:
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Answer 1

$2x + 3 \leqslant 9 \\ 2x \leqslant 6 \\ x \leqslant 3 \: \: , \: \: x\in\mathbb{N} {}^{ {}^{*} } \\ \\ \\ \implies \: x\in\{1,2,3\}$