lim趋于无穷 x^2-1/2x^2-x-1.
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lim趋于无穷 x^2-1/2x^2-x-1.
![lim趋于无穷 x^2-1/2x^2-x-1.](/uploads/image/z/19519662-30-2.jpg?t=lim%E8%B6%8B%E4%BA%8E%E6%97%A0%E7%A9%B7+x%5E2-1%2F2x%5E2-x-1.)
lim趋于无穷 x^2-1/2x^2-x-1
=lim趋于无穷 (x+1)(x-1)/(x-1)(2x+1)
==lim趋于无穷 (x+1)/(2x+1)
=1/2
=lim趋于无穷 (x+1)(x-1)/(x-1)(2x+1)
==lim趋于无穷 (x+1)/(2x+1)
=1/2
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