a-1分之a -a+1分之1其中a=根号3

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a-1分之a -a+1分之1其中a=根号3
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a-1分之a -a+1分之1其中a=根号3
a-1分之a -a+1分之1其中a=根号3

a-1分之a -a+1分之1其中a=根号3
=a(a+1)/(a+1)(a-1) -(a-1)/(a+1)(a-1)
=[a(a+1)-(a-1)]/(a+1)(a-1)
=(a²+1)/(a²-1)
当a=√3时
原式=(3+1)/(3-1)=2


a/(a-1)-1/(a+1)
=a(a+1)/(a-1)(a+1)-(a-1)/(a-1)(a+1)
=(a²+a-a+1)/(a²-1)
=(a²+1)/(a²-1)
=(3+1)/(3-1)
=2

先整理这个式子:先同分,同分后得到a²-1分之a²+1.最后得到2