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

Toán Lớp 8: Rút gọn phân thức sau : $\frac{x^{2}-4x-y^{2}+4}{x(x-2)^{2}-2x(x-2)y+xy^{2}}$

Toán Lớp 8: Rút gọn phân thức sau :
$\frac{x^{2}-4x-y^{2}+4}{x(x-2)^{2}-2x(x-2)y+xy^{2}}$

Comments ( 2 )

  1. (x^2-4x-y^2+4)/(x(x-2)^2-2x(x-2)y+xy^2)
    =((x-2)^2-y^2)/(x[(x-2)^2-2y(x-2)+y^2])
    =((x+y-2)(x-y-2))/(x(x-y-2)^2)
    =(x+y-2)/(x(x-y-2))

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

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