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

Toán Lớp 8: (X+2)² – (x – 2)(x+2)=0 Giúp mình câu này với

Toán Lớp 8: (X+2)² – (x – 2)(x+2)=0
Giúp mình câu này với

Comments ( 2 )

  1. (x+2)^2 – (x – 2).(x+2)=0
    <=>(x+2).[(x+2)-(x-2)]=0
    <=>(x+2).(x+2-x+2)=0
    <=>(x+2).4=0
    <=>x+2=0
    <=>x=-2
    Vậy x=-2
     

  2. (x+2)^2-(x-2)(x+2)=0
    => (x+2)*(x+2-x+2)=0
    => (x+2)*4=0
    => x+2=0
    => x=-2
    Vậy x=-2

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