当a=1/√3时,求1-2a+a2/a2-1+2a2-4a/a2-a-2的值当a=1/√3时,求(1-2a+a²)/(a²-1)+(2a²-4a)/(a²-a-2)

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当a=1/√3时,求1-2a+a2/a2-1+2a2-4a/a2-a-2的值当a=1/√3时,求(1-2a+a²)/(a²-1)+(2a²-4a)/(a²-a-2)
当a=1/√3时,求1-2a+a2/a2-1+2a2-4a/a2-a-2的值
当a=1/√3时,求(1-2a+a²)/(a²-1)+(2a²-4a)/(a²-a-2)

当a=1/√3时,求1-2a+a2/a2-1+2a2-4a/a2-a-2的值当a=1/√3时,求(1-2a+a²)/(a²-1)+(2a²-4a)/(a²-a-2)
(1-2a+a²)/(a²-1)+(2a²-4a)/(a²-a-2)
=(1-a)²/((a-1)(a+1))+2a(a-2)/((a-2)(a+1))
=(a-1)/(a+1)+2a/(a+1)
=(a-1+2a)/(a+1)
=(3a-1)/(a+1)
=(3/√3-1)/(1/√3+1)
=((3-√3)/√3)/(4/√3)
=(3-√3)/4