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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: A={71;72;73;74}
b: B={41;43;45;47;49}
c: C={0}
d: D=R
A = ( 71,72,73,74 )
B = ( 41,43,45,47,49 )
C = ( 0)
D = ( 1,2,3,4,5,6,7,......., N )
a, { x \(\in\) N | 5 < x < 9 }
A = { 6;7;8 }
b, { x \(\in\) N* | x < 7 }
B = { 1;2;3;4;5;6 }
\(M=\left\{1;3;5;6;10;15;30\right\}\)
\(P=\left\{21;24;27;30;33;36;39;42;45;48\right\}\)
bạn ko trả lời câu c) à