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

Toán Lớp 8: x²-4-(x+2)(x-1)=0 làm giùm mình nha

Toán Lớp 8: x²-4-(x+2)(x-1)=0 làm giùm mình nha

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:

     x^2-4-(x+2)(x-1)=0

    => x^2-2^2-(x+2)(x-1)=0

    => (x-2)(x+2)-(x+2)(x-1)=0

    => (x+2).[(x-2)-(x-1)]=0

    => (x+2).(x-2-x+1)=0

    => (x+2).(-1)=0

    => x+2=0

    => x=-2

    Vậy x=-2

    Harryisthebest OvO

  2. $x^2-4-(x+2)(x-1)=0$

    $⇒ (x-2)(x+2)-(x+2)(x-1)=0$

    $⇒ (x+2)[(x-2)-(x-1)]=0$

    $⇒ (x+2)(x-2-x+1)=0$

    $⇒ (x+2).(-1)=0$

    $⇒ x+2=0$

    $⇒ x=-2$

    Vậy $x=-2$

    $#mie1208$

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