Question

Va dau 20 de puncte
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Answer 1

Răspuns:

card (S ∩ N) = 4

Explicație pas cu pas:

$\frac{3x - 1}{3} + \frac{x - 21}{6} \leqslant 0 \\ 2(3x - 1) + x - 21 \leqslant 0\\ 6x - 2 + x - 21 \leqslant 0 \\ 7x \leqslant 23 = > x \leqslant \frac{23}{7} \\ 3 < \frac{23}{7} < 4$

S ∩ N = {0; 1; 2; 3}

card (S ∩ N) = 4