（4a/a平方-1）+(1+a/1-a)
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原式=4a/(a+1)(a-1)-(a+1)/(a-1)
=[4a-(a+1)²]/(a+1)(a-1)
=-(a²+2a+1-4a)/(a+1)(a-1)
=-(a²-2a+1)/(a+1)(a-1)
=-(a-1)²/(a+1)(a-1)
=(1-a)/(1+a)
=[4a-(a+1)²]/(a+1)(a-1)
=-(a²+2a+1-4a)/(a+1)(a-1)
=-(a²-2a+1)/(a+1)(a-1)
=-(a-1)²/(a+1)(a-1)
=(1-a)/(1+a)
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4a/(a²-1)+ (1+a)/(1-a)
=4a/[(a+1)(a-1)] -(a+1)/(a-1)
=[4a -(a+1)²]/[(a+1)(a-1)]
=(4a-a²-2a-1)/[(a+1)(a-1)]
=-(a²-2a+1)/[(a+1)(a-1)]
=-(a-1)²/[(a+1)(a-1)]
=(1-a)/(a+1)
=(2-a-1)/(a+1)
=2/(a+1) -1
=4a/[(a+1)(a-1)] -(a+1)/(a-1)
=[4a -(a+1)²]/[(a+1)(a-1)]
=(4a-a²-2a-1)/[(a+1)(a-1)]
=-(a²-2a+1)/[(a+1)(a-1)]
=-(a-1)²/[(a+1)(a-1)]
=(1-a)/(a+1)
=(2-a-1)/(a+1)
=2/(a+1) -1
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