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

Toán Lớp 9: `x-`$\sqrt{2x+3}$`=0` giải pt nhá

Toán Lớp 9: x-$\sqrt{2x+3}$=0
giải pt nhá

Comments ( 1 )

  1. ĐKXĐ: x>=-3/2
    x-\sqrt{2x+3}=0
    <=>\sqrt{2x+3}=x(x>=0)
    <=>2x+3=x^2
    <=>x^2-2x-3=0
    <=>(x-3)(x+1)=0
    <=>[(x-3=0),(x+1=0):}
    <=>[(x=3(TM)),(x=-1(L)):}
    Vậy S={3}

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