(a^3 - a^2 - a + 1)/(a^3 - 3a^2 + 3a - 1) 化简.

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(a^3 - a^2 - a + 1)/(a^3 - 3a^2 + 3a - 1) 化简.
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(a^3 - a^2 - a + 1)/(a^3 - 3a^2 + 3a - 1) 化简.
(a^3 - a^2 - a + 1)/(a^3 - 3a^2 + 3a - 1) 化简.

(a^3 - a^2 - a + 1)/(a^3 - 3a^2 + 3a - 1) 化简.
(a^3 - a^2 - a + 1)/(a^3 - 3a^2 + 3a - 1)
=(a²-1)(a-1)/[(a³-1)-3a(a-1)]
=(a-1)²(a+1)/[(a-1)(a²-2a+1)
=(a-1)²(a+1)/[(a-1)³]
=(a+1)/(a-1)

=(a²(a-1)-(a-1))/(a-1)³
=(a-1)*(a²-1)/(a-1)³
=(a-1)²(a+1)/(a-1)³
=(a+1)/(a-1)