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

Toán Lớp 8: tìm x 2(3x-1)(2x+5)-6(2x-1)(x+2)=-6 thank ccần gấp }}

Toán Lớp 8: tìm x 2(3x-1)(2x+5)-6(2x-1)(x+2)=-6 thank ccần gấp }}

Comments ( 2 )

  1. Giải đáp:
     x=-1
    Lời giải và giải thích chi tiết:
     2(3x-1)(2x+5)-6(2x-1)(x+2)=-6
    => (6x-2)(2x+5) – (12x – 6)(x+2) = -6
    => (12x^2 + 30x – 4x – 10) – (12x^2 + 24x – 6x – 12) = -6
    => 12x^2 + 30x – 4x – 10 – 12x^2 – 24x + 6x  +12 = -6
    => (12x^2 – 12x^2) + (30x – 4x – 24x + 6x) + (12 – 10) = -6
    => 8x + 2 = -6
    => 8x = -8
    => x = -1
    Vậy x= -1

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

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