Đề THTa - HackMD

## Đề thi ![image](https://hackmd.io/_uploads/Syk_XLKpyg.png) ![image](https://hackmd.io/_uploads/H1e8X8Yp1x.png) ## Bài 3 ![image](https://hackmd.io/_uploads/HJX3U8Kpkl.png)

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