Question

[bùi việt hà]

bằng trục số hãy tìm x thỏa mãn:

1.\(\left\{{}\begin{matrix}x< 5\\\left[{}\begin{matrix}x< -2\\x>1\end{matrix}\right.\end{matrix}\right.\)

2.\(\left\{{}\begin{matrix}x>0\\\left[{}\begin{matrix}x>1\\x< 0\end{matrix}\right.\end{matrix}\right.\)

3.\(\left[{}\begin{matrix}\left\{{}\begin{matrix}x>1\\x< 5\end{matrix}\right.\\x< -2\\\end{matrix}\right.\)

4.\(\left[{}\begin{matrix}x>2\\\left\{{}\begin{matrix}x< 5\\x>-2\end{matrix}\right.\\\end{matrix}\right.\)

Answer 1

[Nguyễn Lê Phước Thịnh]

1: \(x\in\left(1;5\right)\cup\left(-\infty;-2\right)\)

2: x>1

4: \(x\in\left(-2;+\infty\right)\)