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![](https://rs.olm.vn/images/avt/0.png?1311)
\(A=[4;+\infty)\)
\(B=\left(6;9\right)\)
\(B\backslash A=\varnothing\)
![](https://rs.olm.vn/images/avt/0.png?1311)
có link thui nha, bn vào link rùi tải về nhé
https://text.123doc.net/document/2878377-chuyen-de-phep-bien-hinh-trong-mat-phang.htm
https://www.mediafire.com/file/s5p474qbjfbqd47/C%25C3%25A1c_b%25C3%25A0i_gi%25E1%25BA%25A3ng_v%25E1%25BB%2581_s%25E1%25BB%2591_h%25E1%25BB%258Dc.pdf/file
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1) \(x\in A\Leftrightarrow x^2\le25\Leftrightarrow-5\le x\le5\) nên \(A=\left[-5;5\right]\).
2) \(x\in B\Leftrightarrow-4< x< 5\) nên \(B=\left(-4;5\right)\)
3) \(x\in C\Leftrightarrow x\le-4\) nên \(C=\left(-\infty;-4\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(A\cup B=\left(-2;2\right)\)
\(A\cap B=\left\{0\right\}\)
\(A\B=\left(-2;0\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(A\cup B=\left(-2;2\right)\\ A\cap B=\left\{0\right\}\\ A\B=\left(-2;0\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(A\cup B=\left(-2;2\right)\)
\(A\cap B=0\)
A\B=(-2;0)
\(x\in[a;b)\)
thì a<=x<b