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

Toán Lớp 8: phan tich da thuc thanh nhan tu (4x^2 – 4x +1) – (x+1)^2

Toán Lớp 8: phan tich da thuc thanh nhan tu
(4x^2 – 4x +1) – (x+1)^2

Comments ( 2 )

  1. $(4x^{2}-4x+1)-(x+1)^{2}$
    $=(2x-1)^{2}-(x+1)^{2}$
    $=(2x-1+x+1)(2x-1-x-1)$
    $=3x(x-2)$

  2. Giải đáp:
       (4x² -4x +1)-(x+1)^2 =3x(x-2)
    Lời giải và giải thích chi tiết:
        (4x² -4x +1)-(x+1)^2
    = [(2x)^2 -2.2x +1] -(x+1)^2
    = (2x -1)^2 -(x+1)^2
    = (2x-1 +x+1)( 2x -1 -x-1)
    = 3x(x -2)

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

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