(a＼a＠-1)+(3a+1＼a＠-1)+(2a+3＼1-a＠)
=a/[(a+1)(a-1])+(3a+1)/[(a+1)(a-1)+(2a+3)/[(1-a)(1+a)]
=(a+3a+1-2a-3)/(a+1)(a-1)
=(2a-2)/(a+1)(a-1)
=2/(a+1)
(a＼a＠-1)+(3a+1＼a＠-1)+(2a+3＼1-a＠)化简,＠代表平方.
(a＼a＠-1)+(3a+1＼a＠-1)+(2a+3＼1-a＠)化简,＠代表平方.
数学人气：380 ℃时间：2020-02-20 14:53:54
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