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

Toán Lớp 7: TÌM X (x – 1) ^ 2=25 Lànm nhanh ạh

Toán Lớp 7: TÌM X
(x – 1) ^ 2=25
Lànm nhanh ạh

Comments ( 2 )

  1. (x-1)^2=25
    => [((x-1)^2=5^2),((x-1)^2=(-5)^2):}
    => [(x-1=5),(x-1=-5):}
    => [(x=5+1),(x=-5+1):}
    => [(x=6),(x=-4):}
    Vậy x in {6; -4}

  2. $(x-1)^2=25\\\to \left[ \begin{array}{l}(x-1)^2=5^2\\(x-1)^2=(-5)^2\end{array} \right.\\\to \left[ \begin{array}{l}x-1=5\\x-1=-5\end{array} \right.\\\to \left[ \begin{array}{l}x=5+1\\x=-5+1\end{array} \right.\\\to \left[ \begin{array}{l}x=6\\x=-4\end{array} \right.$
    Vậy $x=6$ hoặc $x=-4$
     

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