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

Toán Lớp 8: x^2-4y^2+ 2xz+ z^2+ 4y-1 phân tích thành nhân tử ạ

Toán Lớp 8: x^2-4y^2+ 2xz+ z^2+ 4y-1 phân tích thành nhân tử ạ

Comments ( 2 )

  1. $\text{$x^{2}$ -4$y^{2}$ +2xz+$z^{2}$ +4y-1}$
    $\text{=(x+z$)^{2}$ -(4$y^{2}$ -4y+1}$
    $\text{=(x+z$)^{2}$ -(2y-1$)^{2}$ }$
    $\text{=(x+z-[2y-1]).(x+z+[2y-1])}$
    $\text{=(x+z-2y+1)(x+z+2y-1)}$
    #Zie

  2. x^2 – 4y^2 + 2xz + z^2 + 4y – 1
    = (x^2 + 2xz + z^2) – (4y^2 – 4y + 1)
    = (x + z)^2 – (2y – 1)^2
    = (x + z – 2y + 1)(x + z + 2y – 1)

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

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