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

Toán Lớp 8: (x-2)^3 – x.(x+1).(x-1) + 6x^2 = 5 tìm x

Toán Lớp 8: (x-2)^3 – x.(x+1).(x-1) + 6x^2 = 5
tìm x

Comments ( 2 )

  1. Giải đáp:
    x = 1
    Lời giải và giải thích chi tiết:
    (x – 2)^3 – x(x + 1)(x – 1) + 6x^2 = 5
    (x^3 – 3.x^2 . 2 + 3.x.2^2 – 2^3) – x(x^2 – 1) + 6x^2 – 5 = 0
    (x^3 – 6x^2 + 12x – 8) – x^3 + x + 6x^2 – 5 = 0
    x^3 – 6x^2 + 12x – 8 – x^3 + x + 6x^2 – 5 = 0
    (x^3 – x^3) + (6x^2 – 6x^2) + (12x + x) – (8 + 5) = 0
    13x – 13 = 0
    => x = 1
    Vậy x = 1
    #SunHee

  2. $\left(x-2\right)^3-x\left(x+1\right)\left(x-1\right)+6x^2=5$
    $⇔13x-8=5$
    $⇔13x-8+8=5+8$
    $⇔13x=13$
    $⇔\frac{13x}{13}=\frac{13}{13}$
    $⇔x=1$
    Vậy $x=1$

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

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