约分:x-1/x^2-2x+1;a^2-4/a^2-4a+4

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约分:x-1/x^2-2x+1;a^2-4/a^2-4a+4
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约分:x-1/x^2-2x+1;a^2-4/a^2-4a+4
约分:x-1/x^2-2x+1;a^2-4/a^2-4a+4

约分:x-1/x^2-2x+1;a^2-4/a^2-4a+4
1.(x-1)/(x-1)^2=1/(x-1)
2.(a^2-4)/(a-2)^2=(a-2)(a+2)/(a-2)^2=(a+2)/(a-2)