Bỏ dấu ngoặc rồi tính a) 159−524−59−424; b) 36+79+145−79−36; c) 334−117+234+42+117; d) 271−(−43)+271−(−17).

* Hướng dẫn giải

$\begin{array}{l}a)159-524-\left(59-424\right)\end{array}$

$\begin{array}{l}=159-524-59+424\end{array}$

$\begin{array}{l}=\left(159-59\right)-\left(524-424\right)\end{array}$

$\begin{array}{l}=100-100\\ =0\end{array}$

$\begin{array}{l}b)\left(36+79\right)+\left(145-79-36\right)\end{array}$

$\begin{array}{l}=36+79+145-79-36\end{array}$

$\begin{array}{l}=\left(36-36\right)+\left(79-79\right)+145\end{array}$

$\begin{array}{l}=145\end{array}$

$\begin{array}{l}c)334-\left(117+234\right)+\left(42+117\right)\end{array}$

$\begin{array}{l}=334-117-234+42+117\end{array}$

$\begin{array}{l}=\left(334-234\right)-\left(117-117\right)+42\end{array}$

$\begin{array}{l}=100+42\\ =142\end{array}$

$\begin{array}{l}d)271-(\left[\left(-\mathrm{43)}\right)+271-(\left(-\mathrm{17)}\right)\right]\end{array}$

$\begin{array}{l}=271-(\left[-\mathrm{43)}+271+17\right]\end{array}$

$\begin{array}{l}=271+43-271-17\end{array}$

$\begin{array}{l}=\left(271-271\right)+\left(43-17\right)\end{array}$

$\begin{array}{l}=26\end{array}$