$\begin{array}{l} A = \left\{ {\left( {x,{x^2}} \right)|x \in \left\{ { - 1;0;1} \right\}} \right\}\\ \Rightarrow A = \left\{ {\left( { - 1;1} \right),\left( {0;0} \right),\left( {1;1} \right)} \right\}\\ B = \left\{ {\left( {x;y} \right)|{x^2} + {y^2} \le 2|x,y \in \mathbb{Z}} \right\}\\ {x^2} + {y^2} \le 2 \Rightarrow 0 \le {x^2} \le 2 \Rightarrow {x^2} = 0,1\left( {do\,x \in \mathbb{Z}} \right)\\ \Rightarrow x = 0, - 1,1\\ TT:0 \le {y^2} \le 2 \Rightarrow {y^2} = 0,1 \Rightarrow y = 0, - 1,1\\ \Rightarrow B = \left\{ {\left( {0;0} \right),\left( {0; - 1} \right),\left( {0;1} \right)\left( { - 1;0} \right),\left( { - 1; - 1} \right),\left( { - 1;1} \right),\left( {1;0} \right),\left( {1; - 1} \right),\left( {1;1} \right)} \right\} \end{array}$
