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

Toán Lớp 8: x 2 ( x^2 – 2) – x( x^3 + 2x) = 0

Toán Lớp 8: x 2 ( x^2 – 2) – x( x^3 + 2x) = 0

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    x^2( x^2 – 2) – x( x^3 + 2x) = 0
    ⇔ x^4-2x^2-x(x^3+2x)=0
    ⇔ x^4-2x^2-x^4-2x^2=0
    ⇔ -2x^2 – 2x^2=0
    ⇔ -4x^2 = 0

  2. $⇔ x^4 – 2x^2 – x^4 – 2x^2 = 0$
    $⇔ -4x^2 = 0$
    $⇔x^2 = 0$
    $⇔x=0$

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