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

Toán Lớp 8: 4(x + 3)(3x – 2) – 3(x – 1)(4x – 1) giúp tui vs

Toán Lớp 8: 4(x + 3)(3x – 2) – 3(x – 1)(4x – 1) giúp tui vs

Comments ( 2 )

  1. 4(x + 3)(3x – 2) – 3(x – 1)(4x – 1)
    =(4x+12)(3x-2) – (3x-3)(4x-1)
    =12x²-8x+36x-24 – (12x²-3x-12x+3)
    =12x²+28x-24- 12x²+3x+12x-3
    =43x-27
    mà đề bài là tìm x
    => 43x-27 =0
    ⇔43x=27
    ⇔x=27/43
    Vậy x∈ {27/43} hay S={27/43}

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    4(x + 3)(3x – 2) – 3(x – 1)(4x – 1)
    ⇔(4x+12)(3x-2)+(3x+3)(4x-1)
    ⇔12x²-8x+36x-24+12x²-3x+12x-3
    ⇔ 12x²-8x+36x-24-12x²-3x+12x-3
    ⇔37x-27
    chúc bạn học tốt ạ ^^

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

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