Cho tập hợp P là hợp số, điền các ký hiệu \(\in ;\notin ;\subset \)cho đúng:
\(A. \, 0\,\square \,P\)
\(B. \, \text{2}\,\square\,\,P\)
\(C. \, \text{ }\!\!\{\!\!\text{ 9;144;255 }\!\!\}\!\!\text{ }\,\square \,\,P\)
\(D. \, P\,\,\square \,\,N\)
A.\(\begin{align} & A.\,\,\,\,0\in P \\ & B.\,\,\,\,2\notin P \\ & C.\,\,\,\,\text{ }\!\!\{\!\!\text{ 9;144;255 }\!\!\}\!\!\text{ }\subset \text{P} \\ & D.\,\,\,\,P \in N \\ \end{align}\)
B.\(\begin{align} & A.\,\,\,\,0 \notin P \\ & B.\,\,\,\,2\notin P \\ & C.\,\,\,\,\text{ }\!\!\{\!\!\text{ 9;144;255 }\!\!\}\!\!\text{ }\subset \text{P} \\ & D.\,\,\,\,P\subset N \\ \end{align}\)
C.\(\begin{align} & A.\,\,\,\,0\in P \\ & B.\,\,\,\,2\notin P \\ & C.\,\,\,\,\text{ }\!\!\{\!\!\text{ 9;144;255 }\!\!\}\!\!\text{ }\in \text{P} \\ & D.\,\,\,\,P\subset N \\ \end{align}\)
D.\(\begin{align} & A.\,\,\,\,0\in P \\ & B.\,\,\,\,2\notin P \\ & C.\,\,\,\,\text{ }\!\!\{\!\!\text{ 9;144;255 }\!\!\}\!\!\text{ }\in \text{P} \\ & D.\,\,\,\,P\in N \\ \end{align}\)
