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

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

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

Comments ( 2 )

  1. #huy
    ( 2x – 1 ) ^2 – ( x + 2 ) ^2 = 0
    <=>(2x-1-x-2)(2x-1+x+2)=0
    <=>(x-3)(3x+1)=0
    <=>[(x-3=0),(3x+1=0):}
    <=>[(x=3),(x=-1/3):}
    Vậy x=3 hoặc x=-1/3
     

  2. $(2x-1)^2-(x+2)^2=0$
    $⇔ (2x-1-x-2)(2x-1+x+2)=0$
    $⇔ (x-3)(3x+1)=0$
    $⇔ x-3=0$ hoặc $3x+1=0$
    $⇔ x=3$ hoặc $x=-\dfrac13$

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

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