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

Toán Lớp 8: 2x^2 + 2x + = 0 giúp mình với

Toán Lớp 8: 2x^2 + 2x + = 0 giúp mình với

Comments ( 2 )

  1. #Sad
    2x^2+2x+1/2 = 0
    ⇔ 1/2(4x^2+4x+1) = 0
    ⇔ 1/2(2x+1)^2 = 0
    ⇔ (2x+1)^2 = 0
    ⇔ 2x+1 = 0
    ⇔ 2x = -1
    ⇔ x =-1/2
    \text{Vậy S=} {-1/2}
     

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

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