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

Toán Lớp 8: ( x +2)^2 – ( x – 2)( x-1) = 0

Toán Lớp 8: ( x +2)^2 – ( x – 2)( x-1) = 0

Comments ( 1 )

  1. (x+2)^2-(x-2).(x-1)=0
    ⇔(x^2+4x+4)-(x^2-x-2x+2)=0
    ⇔x^2+4x+4-x^2+x+2x-2=0
    ⇔7x+2=0
    ⇔7x=-2
    ⇔x=-2/7
    Vậy x∈{-2/7}
    $#chúc tus học tốt!!$
    #La

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

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