Question

exercițiu mate.Dau coroana!​

Answer 1

nu stiu daca asa trebuie dar sper sa fie corect

Answer 2

$\it a)\ 3x^3<600|_{:3} \Rightarrow x^3<200 \Rightarrow C=\{0,\ 1,\ 2,\ 3,\ 4,\ 5\}\\ \\ 6^3=216>200,\ nu\ \ convine$

$\it b)\ 0,\ \ 1,\ \ \c si\ 4\ sunt\ p\breve atrate\ perfecte\\ \\ 0=0^2,\ \ 1=1^2,\ \ 4=2^2.$

c)

$\it a\in C,\ x=3a+2 \Rightarrow \begin{cases}\it 3\cdot0+2=2\\ \\ \it 3\cdot1+2=5\\ \\ \it 3\cdot2+2=8\\ \\ \it 3\cdot3+2=11\\ \\ \it 3\cdot4+2=14\\ \\ \it 3\cdot5+2=17\end{cases}\\ \\ \\ D=\{2,\ 5,\ 8,\ 11,\ 14,\ 17\}$