5.
\(A\cup B=\left\{2;3;4;5;7\right\}\)
\(A\cap B=\left\{2;5\right\}\)
\(A\backslash\left(A\cap B\right)=\left\{4\right\}\)
6.
Các tập con:
\(\varnothing;\left\{a\right\};\left\{b\right\};\left\{c\right\};\left\{d\right\};\left\{a;b\right\};\left\{a;c\right\};\left\{a;d\right\};\left\{b;c\right\};\left\{b;d\right\};\left\{c;d\right\}\)
\(\left\{a;b;c\right\};\left\{a;b;d\right\};\left\{a;c;d\right\};\left\{b;c;d\right\};\left\{a;b;c;d\right\}\)
7.
\([-5;2)\cup[2;5)=[-5;5)\)
\((0;3]\cap\left[1;4\right]=\left[1;3\right]\)
\(\left(-\infty;-3\right)\cup[-5;0)=\left(-\infty;0\right)\)
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