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

Toán Lớp 7: `|2+x|-7=13` NL: Làm tròn 33333 điểm thoou =))

Toán Lớp 7: |2+x|-7=13
NL: Làm tròn 33333 điểm thoou =))

Comments ( 2 )

  1. $\text{|2 + x| − 7 = 13}$ $\\$ $\text{|2 + x| = 13 + 7}$ $\\$ $\text{|2 + x| = 20}$ $\\$ $\text{=> 2 + x = -20 hoặc 2 + x = 20}$ $\\$ $\text{x = -20 – 2 x = 20 – 2}$ $\\$ $\text{x = -22 x = 18}$ $\\$ $\text{Vậy: x = -22 hoặc x = 18}$

  2. |2+x|-7=13
    <=>|2+x|=13+7
    <=>|2+x|=20
    $⇔\left[\begin{matrix} 2+x=20\\ 2+x=-20\end{matrix}\right.$
    $⇔\left[\begin{matrix} x=20-2\\ x=-20-2\end{matrix}\right.$
    $⇔\left[\begin{matrix} x=18\\ x=-22\end{matrix}\right.$
    Vậy x in {18;-22}
     

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