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

Toán Lớp 8: x^2-2x+1=4 ( giup mik voi ) lam theo cach dua ve binh pphuong 1 tong a

Toán Lớp 8: x^2-2x+1=4 ( giup mik voi ) lam theo cach dua ve binh pphuong 1 tong a

Comments ( 2 )

  1. x^2-2x+1=4
    <=>(x^2-2x+1)-4=0
    <=>(x-1)^2-2^2=0
    <=>(x-1-2)(x-1+2)=0
    <=>(x-3)(x+1)=0
    <=> \(\left[ \begin{array}{l}x-3=0\\x+1=0\end{array} \right.\)<=> \(\left[ \begin{array}{l}x=3\\x=-1\end{array} \right.\) 
    Vậy x=3;x=-1

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