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

Toán Lớp 9: (x+1)^2-2=(x-1)(X+1) giúp mình nha:(

Toán Lớp 9: (x+1)^2-2=(x-1)(X+1)
giúp mình nha:(

Comments ( 2 )

  1. (x+1)^2-2=(x-1)(x+1)
    ⇔x^2+2x+1-2-x^2+1=0
    ⇔2x=0
    ⇔x=0
    Vậy x=0
     

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