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

Toán Lớp 7: ( 1 – x )^2 = 64 Giá trị của x?

Toán Lớp 7: ( 1 – x )^2 = 64
Giá trị của x?

Comments ( 2 )

  1. (1-x)^2=64
    ->(1-x)^2=8^2
    ->1-x=+-8
    TH 1:
    1-x=8
    ->x=1-8
    ->x=-7
    TH 2:
    1-x=-8
    ->x=1-(-8)
    ->x=1+8
    ->x=9
    Vậy x=-7;x=9
     

  2. ( 1 – x )^2 = 64
    => $\left[\begin{matrix} 1 – x = 8\\ 1 – x = -8\end{matrix}\right.$             => $\left[\begin{matrix} x = 1 – 8\\x = 1 – ( -8 )\end{matrix}\right.$               => $\left[\begin{matrix} x=-7\\ x=9\end{matrix}\right.$
                             $\text{ Vậy x ∈ { -7 ; 9 } }$
     

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