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

Toán Lớp 8: tìm x áp dụng hằng đẳng thức lớp 8 (x+1)^2-(x-1)^2=0 (2 cách)

Toán Lớp 8: tìm x áp dụng hằng đẳng thức lớp 8
(x+1)^2-(x-1)^2=0 (2 cách)

Comments ( 2 )

  1. Cách 1:
    (x+1)^2-(x-1)^2=0
    <=>x^2+2x+1-(x^2-2x+1)=0
    <=>x^2+2x+1-x^2+2x-1=0
    <=>4x=0
    <=>x=0
    Vậy S={0}
    Cách 2:
    (x+1)^2-(x-1)^2=0
    <=>(x+1-x+1)(x+1+x-1)=0
    <=>2.2x=0
    <=>4x=0
    <=>x=0
    Vậy S={0}
     

  2. #AkaShi
    (x+1)^2-(x-1)^2=0
    ⇔(x+1-x+1)(x+1+x-1)=0
    ⇔2.2x=0
    ⇔4x=0
    ⇔x=0
    Vậy S={0}
     ……….
    (x+1)²-(x-1)²=0
    ⇔x²+2x+1-x²+2x-1=0
    ⇔(x²-x²)+(2x+2x)+(1-1)=0
    ⇔4x=0
    ⇔x=0
    Vậy S={0}

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

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