（a + (1/a)）*(1-a^2)/(1+2a+a^2)
=（a²+1）/a×(1+a)(1-a)/(1+a)²;
=(a²+1)(1-a)/a(1+a);
手機提問的朋友在客戶端右上角評價點【滿意】即可.
化簡（a + (1/a)）*(1-a^2)/(1+2a+a^2)
化簡（a + (1/a)）*(1-a^2)/(1+2a+a^2)
政治人氣：632 ℃時間：2020-06-20 19:23:11
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