Tính: a, -64|-x-6532|(x+8965)|x-8520|=0

* Hướng dẫn giải

$$\begin{gathered} a, \left[\begin{array}{l}x=-6532\\ x=-8965\\ x=8520\end{array}\right. \\ b, \left[\begin{array}{l}x=7984\\ x=465\\ x=-645\end{array}\right. \end{gathered}$$