Question

Multimea numerelor x care verifica relatia 27<2x<+1 este formata din:
a.11 elemente b.12 elemente c.13 elemente
Va roog !!Ugentt !!Dau coroana ,daca imi oferiti si rezolvare!!

Answer 1

[tex]1\ \textless \ 2x\ \textless \ 27\\ Dam\:lui\:x\:valori\:pana\:cand\:2x \geq 27\\ x=1\rightarrow2x=2\ \textless \ 27\\ x=2\rightarrow2x=4\ \textless \ 27\\ \vdots\\x=13\rightarrow2x=26\ \textless \ 27\\ x=14\rightarrow2x=28\ \textgreater \ 27\\ deci\:x\in\{1,2,3,...,12,13 \}. [/tex]
Prin urmare, multimea este formata din 13 elemente.