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

Toán Lớp 8: Tìm x (x+1)^3+(x-2)^3-2x^2(x-1,5)=3

Toán Lớp 8: Tìm x
(x+1)^3+(x-2)^3-2x^2(x-1,5)=3

Comments ( 2 )

  1. Giải đáp: x =2/3
    Lời giải và giải thích chi tiết:
    (x+1)^3+(x-2)^3-2x^2(x-1,5)=3
    = x^3+3x^2+3x+1+x^3-6x^2+12x-8-2x^3+3x^2=3
    = 15x=10
    = x = 10 : 15
    = x =2/3
    $@chienbinhkieuhanh$

  2. Tìm x:
    a) (x+1)^3+(x-2)^3-2x^2(x-1,5)=3
    =>x^3 + 3x^2.1 + 3x.1^2 + 1^3 + (x^3 – 3x^2.2 + 3x.2^2 – 2^3) – 2x^3 – 3x^2 = 3
    => x^3 + 3x^2.1 + 3x.1^2 + 1^3 + x^3 + 3x^2.2 – 3x.2^2 + 2^3 – 2x^3 – 3x^2 = 3
    => x^3 + 3x^2 + 3x + 1 + x^3 + 6x^2 – 12x + 8 – 2x^3 – 3x^2 = 3
    => -9x + 9 = 3
    => -9x = -6
    => x = (-6)/(-9)
    => x = 2/3

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

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