lim(x→∞)(√(x^2+x+1) -x) 怎么求
lim(x→∞)(√(x^2+x+1) -x)
=lim(x→∞)(√(x^2+x+1) -x) (√(x^2+x+1) +x)/(√(x^2+x+1) +x)
=lim(x→∞)(x+1)/(√(x^2+x+1) +x) 分子分母同除以x
=lim(x→∞)(1+1/x)/[√(1+1/x+1/x^2) +1]
=1/(1+1)
=1/2
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