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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

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

Comments ( 2 )

  1. (x-2)^3 – x(x+1)(x-1)+ 6x^2 = 5
    x^3 – 6x^2 + 12x – 8 – x(x^2-1) + 6x^2 = 5
    x^3 – 6x^2 + 12x – 8 – x^3 + x + 6x^2 = 5
    (x^3 – x^3) + (-6x^2+6x^2) + (12x+x) – 8 = 5
    13x – 8 = 5
    13x = 5 + 8
    13x = 13
    x = 13 : 13
    x = 1
    Gửi bn xin hay nhất nếu đc^^

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    (x-2)^3 – x.(x+1).(x-1) + 6x^2 = 5

    x^3-6x^2+12x-8-x.(x^2-1)+6x^2=5
    x^3-6x^2+12x-8-x^3+x+6x^2=5
    13x-8=5
    13x=5+8
    13x=13
    =>x=1
    Vậy x=1

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

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