Question

Giúp mình với

Answer 1

Lời giải:
\(A=\left\{5k|k\in\mathbb{N}; -3\leq k\leq 3\right\}\)

\(B=\left\{\frac{1}{2^k}|k\in\mathbb{N}, 1\leq k\leq 4\right\}\)

\(C=\left\{k|k\in\mathbb{N}, -3\leq k\leq 3\right\}\)

\(D=\left\{2k|k\in\mathbb{N}\right\}\)