\(21,\varnothing;\left\{a\right\};\left\{b\right\};\left\{c\right\};\left\{a;b\right\};\left\{a;c\right\};\left\{b;c\right\};\left\{a;b;c\right\}\\ 22,\\ A=\left\{-2;-1;0;1;2;3;4;5\right\}\\ \left(x^2-4\right)\left(3x^2-10x+3\right)=0\Leftrightarrow\left[{}\begin{matrix}x=2\\x=-3\\x=3\\x=\dfrac{1}{3}\left(ktm\right)\end{matrix}\right.\\ \Leftrightarrow B=\left\{-3;2;3\right\}\\ A\cap B=\left\{2;3\right\}\\ A\cup B=\left\{-3;-2;-1;1;2;3;4;5\right\}\\ A\B=\left\{-2;-1;0;1;4;5\right\}\\ B\A=\left\{-3\right\}\)
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