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

Toán Lớp 8: tìm x: $x^{2}$-x+$\frac{1}{4}$=0

Toán Lớp 8: tìm x:
$x^{2}$-x+$\frac{1}{4}$=0

Comments ( 2 )

  1. x^2 – x + 1/4=0
    <=> x^2 – 2. 1/2 . x + (1/2)^2 = 0
    <=> (x – 1/2)^2 = 0
    <=> x – 1/2 = 0
    <=> x = 1/2
     

  2. Giải đáp + Lời giải và giải thích chi tiết:
    x^2 – x + 1/4 = 0
    ⇔ x^2 – 1/2x – 1/2x + 1/4 =0
    ⇔ x (x-1/2) – 1/2 (x-1/2) = 0
    ⇔ (x-1/2) (x-1/2) = 0
    ⇔ (x-1/2)^2 = 0
    ⇔ x – 1/2 = 0
    ⇔ x = 1/2
    Vậy x = 1/2
     

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

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