计算:(1 - 1/a^2) * (-a^2)/(1-2a+a^2)

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计算:(1-1/a^2)*(-a^2)/(1-2a+a^2)计算:(1-1/a^2)*(-a^2)/(1-2a+a^2)计算:(1-1/a^2)*(-a^2)/(1-2a+a^2)(1-1/a^2)*

计算:(1 - 1/a^2) * (-a^2)/(1-2a+a^2)
计算:(1 - 1/a^2) * (-a^2)/(1-2a+a^2)

计算:(1 - 1/a^2) * (-a^2)/(1-2a+a^2)
(1 - 1/a^2) * (-a^2)/(1-2a+a^2)
=[(a^2 - 1)/a^2] * (-a^2)/(a-1)^2
=-[(a+1)(a-1)]/(a-1)^2=-(a+1)/(a-1)