Question

x+2/x²-2x-x-1/x²-4x+4计算

Answer 1

(x+2)/(x²-2x)-(x-1)/(x²-4x+4)

=(x+2)/[x(x-2)]-(x-1)/(x-2)²

=[(x+2)(x-2)-x(x-1)]/[x(x-2)²]

=(x²-4-x²+x)/[x(x-2)²]

=(x-4)/[x(x-2)²]

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