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

Toán Lớp 8: tìm x biết x^2-2x+1=25 giúp mk với

Toán Lớp 8: tìm x biết x^2-2x+1=25 giúp mk với

Comments ( 2 )

  1. x^2-2x+1=25
    <=>(x-1)^2-25=0
    <=>(x-1-5)(x-1+5)=0
    <=>(x-6)(x+4)=0
    <=> \(\left[ \begin{array}{l}x-6=0\\x+4=0\end{array} \right.\) <=>\(\left[ \begin{array}{l}x=6\\x=-4\end{array} \right.\) 
    Vậy S={6;-4}
     

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