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

Toán Lớp 8: tìm x a,x(x-10)+25=0 b,⇔(2x-1)²=0 d,8x³+12x²+6x+1=0

Toán Lớp 8: tìm x
a,x(x-10)+25=0
b,⇔(2x-1)²=0
d,8x³+12x²+6x+1=0

Comments ( 1 )

  1. a) x(x-10)+25=0
    ⇔x^2-10x+25=0
    ⇔(x-5)^2=0
    ⇔x-5=0
    ⇔x=5
    Vậy x=5
    b) (2x-1)^2=0
    ⇔2x-1=0
    ⇔2x=1
    ⇔x=1/2
    Vậy x=1/2
    d) 8x^3+12x^2+6x+1=0
    ⇔(2x)^3+3.(2x)^{2}.1+3.2x.1+1^3=0
    ⇔(2x+1)^3=0
    ⇔2x+1=0
    ⇔2x=-1
    ⇔x=-1/2
    Vậy x=-1/2
     

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

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