x²+4x+4/x²-4 - x/x-2
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x²+4x+4/x²-4 - x/x-2
x²+4x+4/x²-4 - x/x-2
x²+4x+4/x²-4 - x/x-2
由(x²+4x+4)/(x²-4)-x/(x-2)
=(x+2)²/(x+2)(x-2)-x/(x-2)
=(x+2)/(x-2)-x/(x-2)
=2/(x-2).