Đáp án:
$a)
A\subset B\\
b)
B\subset A\\
c)
B\subset A$
Giải thích các bước giải:
$a)
A=\{1,2,3,4,5\}\\
B=\{n\in Z/ 0\leq |n| \leq 5\}=\{-5,-4,3,-2,-1,0,1,2,3,4,5\}\\
\Rightarrow A\subset B\\
b)
A=\{x\in Z/ (x^2-x-2)(x-1)=0\}\\
(x^2-x-2)(x-1)=0\Leftrightarrow {\left[\begin{aligned}x^2-x-2=0\\x-1=0\end{aligned}\right.}\\
\Leftrightarrow {\left[\begin{aligned}x=2\\ x=-1\\x=1\end{aligned}\right.}\\
\Rightarrow A=\{-1;1;2\}\\
B=\{x\in \mathbb{R}/ x^2+x-2=0\}=\{-1;2\}\\
\Rightarrow B\subset A\\
c)
A=\{x\in \mathbb{R}/ -2<x<4\}=\{-1,0,1,2,3\}\\
B=\{x\in \mathbb{N}/ -4<x<3\}=\{0,1,2\}\\
\Rightarrow B\subset A$
