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

Toán Lớp 9: giải phương trình 3x- √x+1 +1=0

Toán Lớp 9: giải phương trình
3x- √x+1 +1=0

Comments ( 2 )

  1. $3x-\sqrt{x+1}+1=0$ (x≥-1,x≥1/3)
    $⇔3x+1=\sqrt{x+1}$
    $⇔9x^2+6x+1=x+1$
    $⇔9x^2+5x=0$
    $⇔x(9x+5)=0$
    $⇔x=0$ hoặc x=-5/9(loại)
    Vậy…
     

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