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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 10: Giải các pt sau: | 2x + 1 | = | 4x – 7 |

Toán Lớp 10: Giải các pt sau:
| 2x + 1 | = | 4x – 7 |

Comments ( 2 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    |2x +1| = |4x -7|
    <=>\(\left[ \begin{array}{l}2x +1 = 4x-7\\2x + 1 = 7-4x\end{array} \right.\) $\\$ <=>\(\left[ \begin{array}{l}-2x = -8\\6x = 6\end{array} \right.\) $\\$<=>\(\left[ \begin{array}{l}x=4\\x=1\end{array} \right.\) 
    Vậy: S = { 4;1}

  2. Answer
    |2x + 1| = |4x – 7|
    => $\left[\begin{matrix} 2x + 1 = 4x – 7\\ 2x + 1 = – (4x – 7)\end{matrix}\right.$
    => $\left[\begin{matrix} 2x – 4x = -7 – 1\\ 2x + 1 = – 4x + 7\end{matrix}\right.$
    => $\left[\begin{matrix} -2x = -8\\ 2x + 4x = 7 – 1\end{matrix}\right.$
    => $\left[\begin{matrix} x = (-8) : (-2)\\ 6x = 6\end{matrix}\right.$
    => $\left[\begin{matrix} x = 4\\ x = 6 : 6\end{matrix}\right.$
    => $\left[\begin{matrix} x = 4\\ x = 1\end{matrix}\right.$
    $\text{Vậy}$ S = {4 ; 1}

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222-9+11+12:2*14+14 = ? ( )