Register Now

Login

Lost Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

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

Toán Lớp 8: (2x+3)(x+4)+(x-5)(x-2)=(3x-5)(x-4)

Toán Lớp 8: (2x+3)(x+4)+(x-5)(x-2)=(3x-5)(x-4)

Comments ( 2 )

  1. (2x+3)(x+4)+(x-5)(x-2)=(3x-5)(x-4)
    (2x+3)(x-4)+(x-5)(x-2)-(3x-5)(x-4)=0
    2x² – 8x + 3x -12 + x² – 12 + x² – 2x -5x + 10 – 3x² + 12x + 5x  – 20 = 0
    5x =22
    Ta đưa ra phân số 🙂
    x= 22/5
    Vậy x = 22/5
    @ HaiZZZ @

  2. Giải đáp + Lời giải và giải thích chi tiết:
     (2x + 3)(x + 4) + (x – 5)(x – 2) = (3x – 5)(x – 4)
      2x(x + 4) + 3(x + 4) + x(x – 2) – 5(x – 2) = 3x(x – 4) – 5(x – 4)
    2x^2 + 8x + 3x + 12 + x^2 – 2x – 5x + 10 = 3x^2 – 12x – 5x + 20
    3x^2 + 4x + 22 = 3x^2 – 17x + 20
    3x^2 + 4x + 22 – 3x^2 + 17x – 20 = 0
    21x + 2 = 0
    21x = -2
    x     = -2/21
    Vậy S = {-2/21}

Leave a reply

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