Lời giải:
a. $A=\left\{n| n=2k+1, k\in\mathbb{N}, 0\leq k\leq 3\right\}$
b. $B=\left\{n|n=2k, k\in\mathbb{N}\right\}$
c. $C=\left\{n|n=5k, k\in\mathbb{N}, 0\leq k\leq 4\right\}$
d. $D=\left\{n|n=\frac{1}{k(k+1)}, k\in\mathbb{N}, 1\leq k\leq 5\right\}$
e. $E=\left\{n| n=\frac{1}{3^k}, k\in\mathbb{N}, 0\leq k\leq 5\right\}$
f. Giống câu d
g. $G=\left\{n| n\in\mathbb{Z}, -4\leq n\leq 4\right\}$
h.$H=\left\{n|n=3k, k\in\mathbb{N}, 1\leq k\leq 5\right\}$
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