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（1-1÷x-1）÷x²-4x+4÷x²-1
=[1-1/(x-1)]/[(x²-4x+4)/(x²-1)]
=[(x-2)/(x-1)]/[(x-2)²/(x-1)(x+1)]
=[(x-2)/(x-1)]*[(x-1)(x+1)/(x-2)²]
=(x+1)/(x-2)
=4
=[1-1/(x-1)]/[(x²-4x+4)/(x²-1)]
=[(x-2)/(x-1)]/[(x-2)²/(x-1)(x+1)]
=[(x-2)/(x-1)]*[(x-1)(x+1)/(x-2)²]
=(x+1)/(x-2)
=4
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