Tìm x biết: \(147 - \left(...

B

- Hướng dẫn giải

 \(\begin{array}{l}\ \ \,147 - \left( {456 - 39} \right)x = 17 - \left( {52 - 15} \right) - 250\\\,\,\,\,\,147 - 417x = 17 - 37 - 250\\\,\,\,\,\,147 - 417x = - 20 - 250\\\,\,\,\,\,147 - 417x = - 270\\\,\,\,\,\,\,\,\,\,\,\,\,\,\, - 417x = - 270 - 147\\\,\,\,\,\,\,\,\,\,\,\,\,\,\, - 417x = - 417\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x = \left( { - 417} \right):\left( { - 417} \right)\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x = 1\end{array}\)