化简(a的平方+3)/(a的平方-1)-(a+1)/(a-1)-1等于

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化简(a的平方+3)/(a的平方-1)-(a+1)/(a-1)-1等于
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化简(a的平方+3)/(a的平方-1)-(a+1)/(a-1)-1等于
化简(a的平方+3)/(a的平方-1)-(a+1)/(a-1)-1等于

化简(a的平方+3)/(a的平方-1)-(a+1)/(a-1)-1等于
(a²+3)/(a+1)(a-1)-(a+1)²/(a+1)(a-1) -1
=(a²+3-a²-2a-1)/(a+1)(a-1)-1
=(2-2a)/(a+1)(a-1)-1
=-2/(a+1)-1
=(-2-a-1)/(a+1)
=-(3+a)/(a+1)

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