Question

Calculati suma elementelor multimii a={x€n|4<2x-4<_ 8} ajutatima va roggggg!!!!!!!

Answer 1

$A = \Big\{x\in \mathbb_{N} \Big| \ 4\ \textless \ 2x-4\leq 8}\Big\}\\ \\ \\ 4\ \textless \ 2x-4\leq 8\Big|+4 \Rightarrow 8 \ \textless \ 2x\leq 12 \Big|:2 \Rightarrow 4\ \textless \ x\leq 6 \\ \\ \Rightarrow x \in (4,6] \Rightarrow A = \Big\{5,6\Big\} \\ \\ S = 5+6 \Rightarrow \boxed{S = 11}$