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

Toán Lớp 8: 4.(x-1).(x+5)-(x+2).(x+5)=3(x-1).(x+2) Tìm X

Toán Lớp 8: 4.(x-1).(x+5)-(x+2).(x+5)=3(x-1).(x+2)
Tìm X

Comments ( 2 )

  1. Giải đáp:
     x=4
    Lời giải và giải thích chi tiết:
      4 (x-1)(x+5) – (x+2)(x+5) = 3 (x-1)(x+2)
    => (4x – 4)(x+5) – (x^2+ 5x  +2x+10) = (3x-3)(x+2)
    => 4x^2 + 20x – 4x – 20 – x^2-  5x-2x-10=3x^2+6x-3x-6
    => 4x^2 + 20x – 4x – 20 – x^2-  5x-2x-10 – 3x^2 – 6x + 3x + 6 = 0
    => 6x – 24 = 0
    => 6x=24
    =>x=4
    Vậy x=4

  2. #tnvt
    4(x-1)(x+5)-(x+2)(x+5)=3(x-1)(x+2)
    <=>(x+5)[4(x-1)-x-2]-3(x-1)(x+2)=0
    <=>(x+5)(4x-4-x-2)-3(x-1)(x+2)=0
    <=>(x+5)(3x-6)-3(x^2+x-2)=0
    <=>3x^2-6x+15x-30-3x^2-3x+6=0
    <=>6x-24=0
    <=>6x=24
    <=>x=4
    Vậy x=4

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

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