Tính giá trị biểu thức sau: B= -418-{-218-[-118-(-318)+2012]}

* Hướng dẫn giải

$$\begin{gathered} B=-418-\left\{-218-\left[-118-\left(-318\right)+2012\right]\right\} \\ \begin{array}{l}=-418-\left\{-218-\left[-118+318+2012\right]\right\}\\ =-418-\left\{-218-\left[200+2012\right]\right\}\\ =-418-\left\{-218-2212\right\}\\ =-418-\left(-2430\right)\\ =-418+2430\\ =2012.\end{array} \end{gathered}$$