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

Toán Lớp 8: Giá trị. X thỏa mãn 4x -1 4x+1 -16x x+2 =5 là

Toán Lớp 8: Giá trị. X thỏa mãn 4x -1 4x+1 -16x x+2 =5 là

Comments ( 2 )

  1. $\\(4x-1)(4x+1)-16x(x+2)=5\\⇔ (4x)^2-1^2-16x^2 – 32x=5\\⇔ 16x^2 – 1 – 16x^2-32x=5\\⇔-1-32x=5\\⇔ 32x=-6\\⇔x=\dfrac{-3}{16}$
    Vậy $x=\dfrac{-3}{16}$

  2. (4x-1)(4x+1)-16x(x+2)=5
    <=>(4x)^2-1^2-16x^2-32x=5
    <=>16x^2-1-16x^2-32x=5
    <=>(16x^2-16x^2)-32x=5+1
    <=>-32x=6
    <=>x=(-3)/16
    vậy S={(-3)/16}
     

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