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1/\(A=\left\{21;24;27;30;33;36;39\right\}\)
\(B=\left\{30;35;40\right\}\)
\(C=\left\{32;36;40\right\}\)
2/\(D=\left\{30\right\}\)\(;\)\(E=\left\{40\right\}\)\(;\)\(F=\left\{36\right\}\)
1. \(A=\left\{35;40;45\right\}\)và \(B=\left\{32;34;36;38;40;42;44;46;48\right\}\)
2. \(F=\left\{35\right\}\subset A;G=\left\{40\right\}\subset A;H=\left\{45\right\}\subset A;I=\left\{35;40\right\}\subset A;J=\left\{35;45\right\}\subset A;\)\(K=\left\{40;45\right\}\subset A;A=\left\{35;40;45\right\}\subset A\)
3. \(C=\left\{40\right\};D=\left\{32;34;35;36;38;40;42;44;45;46;48\right\}\)
\(A=\left\{0;1;2;3;4;5;6;7;8;9;10;11;12\right\}\)
\(B=\left\{17;18;19;20;21;22;23;24\right\}\)
\(C=\left\{0;2\right\}\)
\(D=\left\{0;6;12;18;24;30\right\}\)
A = { 0 ; 1 ; 2 ; 3 ; 4 ; 5 ; 6 ; 7 ; 8 ; 9 ; 10 ; 11 ; 12 }
B = { 17 ; 18 ; 19 ; 20 ; 21 ; 22 ; 23 ; 24 }
C = { 0 ; 2 }
D = { 0 ; 6 ; 12 ; 18 ; 24 ; 30 }
\(M=\left\{1;3;5;6;10;15;30\right\}\)
\(P=\left\{21;24;27;30;33;36;39;42;45;48\right\}\)
a, { x \(\in\) N | 5 < x < 9 }
A = { 6;7;8 }
b, { x \(\in\) N* | x < 7 }
B = { 1;2;3;4;5;6 }
