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

Toán Lớp 8: b) (5x- 1) ( 2x +7) – 10x ( x -6) = 4x -5

Toán Lớp 8: b) (5x- 1) ( 2x +7) – 10x ( x -6) = 4x -5

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
      (5x- 1) ( 2x +7) – 10x ( x -6) = 4x -5
    ⇔ 5x(2x+7)-1(2x+7)-10x(x-6)=4x-5
    ⇔ 10x^2+35x-2x-7-10x(x-6)=4x-5
    ⇔ 10x^2+33x-10x^2+60x=4x-5
    ⇔ 93x-7=4x-5
    ⇔ 93x = 4x+2
    ⇔ 89x =2
    ⇔ x = 2/89
    Vậy x = 2/89

  2. b) (5x- 1) ( 2x +7) – 10x ( x -6) = 4x -5
    <=> 10x^2 + 35x – 2x – 7 – 10x^2 + 60x – 4x + 5 = 0
    <=>89x – 2 =0
    <=> 89x = 2
    <=> x = 2/89
     

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