\(1,\\ a,A=\left\{0;1;2;3\right\}\\ b,4x^3-x=0\Leftrightarrow x\left(2-x\right)\left(2+x\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=0\\x=2\\x=-2\end{matrix}\right.\Leftrightarrow C=\left\{-2;0;2\right\}\\ c,\left|x\right|< 1\Leftrightarrow-1< x< 1\Leftrightarrow x=0\\ D=\left\{0\right\}\\ d,E=\left\{0;2;4;6\right\}\)
\(2,\\ a,A=\left\{x=2k|k\in N;k< 6\right\}\\ b,C=\left\{x\in Z|-4< x\le4\right\}\\ c,D=\left\{x=\left(\dfrac{1}{3}\right)^k|k\in N,k< 5\right\}\)
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