A)C={6;7;8} C={x\(\in\)N|5<x<9}
B){\(\varnothing\)} {6} {7} {8} {6;7} {6;8} {7;8}
ko hiểu sao A) C1:C={6;7;8} C2:C={x\(\in\)N|5<x<9}
a,
Cách 1 : \(c=\left\{6;7;8\right\}\)
Cách 2 : \(c=\left\{x\in N;5< x< 9\right\}\)
b, \(\varnothing;\left\{6\right\};\left\{7\right\};\left\{8\right\};\left\{6;7\right\};\left\{6;8\right\};\left\{7;8\right\}\)
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