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

Toán Lớp 8: 3x (2x – 5) – 6x^2 = -13x + 12

Toán Lớp 8: 3x (2x – 5) – 6x^2 = -13x + 12

Comments ( 2 )

  1. Giải đáp:
    S  = {-6}
    Lời giải và giải thích chi tiết:
    3x (2x – 5) – 6x^2 = -13x + 12
    ⇔ 6x^2 – 15x – 6x^2 + 13x = 12
    ⇔ -2x = 12
    ⇔ x = -6
    Vậy S  = {-6}

  2. 3x(2x-5)-6x^2=-13x+12
    ->3x.2x-3x.5-6x^2=-13x+12
    ->6x^2-15x-6x^2=-13x+12
    ->(6x^2-6x^2)-15x=-13x+12
    ->-15x=-13x+12
    ->-15x+13x=12
    ->-2x=12
    ->x=12:(-2)
    ->x=-6
    Vậy x=-6

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

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