请问,曲线 y=x+(x^2-x+1)^1/2 的渐近线如何求?
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请问,曲线 y=x+(x^2-x+1)^1/2 的渐近线如何求?
设渐近线方程为y=ax+b.则:
a
=lim(x→∞){[x+√(x^2-x+1)]/x}
=lim(x→∞)[1+√(1-1/x+1/x^2)]
=[1+√(1-0+0)]
=2.
b
=lim(x→∞)[x+√(x^2-x+1)-ax]
=lim(x→∞)[x+√(x^2-x+1)-2x]
=lim(x→∞)[√(x^2-x+1)-x]
=lim(x→∞){[(x^2-x+1)-x^2]/[√(x^2-x+1)+x]}
=lim(x→∞){(1-x)/[√(x^2-x+1)+x]}
=lim(x→∞){(1/x-1)/[√(1-1/x+1/x^2)+1]}
=(0-1)/[√(1-0+0)+1]
=-1/2.
∴给定曲线的渐近线是:y=2x-1/2.
再问: 谢谢,不过你的解析和答案不完全一致。答案是一条左侧水平渐近线和一条右侧斜渐近线。能否说明?
再答: 抱歉!我没注意到x趋向-∞的情况,现补充如下: ∵lim(x→-∞){[x+√(x^2-x+1)] =lim(x→-∞){[(x^2-x+1)-x^2]/[√(x^2-x+1)-x]} =lim(x→-∞){(-x+1)/[√(x^2-x+1)-x]} =-lim(x→-∞){(-1+1/x)/√[1-1/x+1/x^2)+1]} =-(-1+0)/√[1-0+0)+1] =1/2。 ∴y=1/2是给定曲线的水平渐近线,而y=2x-1/2是斜渐近线。
a
=lim(x→∞){[x+√(x^2-x+1)]/x}
=lim(x→∞)[1+√(1-1/x+1/x^2)]
=[1+√(1-0+0)]
=2.
b
=lim(x→∞)[x+√(x^2-x+1)-ax]
=lim(x→∞)[x+√(x^2-x+1)-2x]
=lim(x→∞)[√(x^2-x+1)-x]
=lim(x→∞){[(x^2-x+1)-x^2]/[√(x^2-x+1)+x]}
=lim(x→∞){(1-x)/[√(x^2-x+1)+x]}
=lim(x→∞){(1/x-1)/[√(1-1/x+1/x^2)+1]}
=(0-1)/[√(1-0+0)+1]
=-1/2.
∴给定曲线的渐近线是:y=2x-1/2.
再问: 谢谢,不过你的解析和答案不完全一致。答案是一条左侧水平渐近线和一条右侧斜渐近线。能否说明?
再答: 抱歉!我没注意到x趋向-∞的情况,现补充如下: ∵lim(x→-∞){[x+√(x^2-x+1)] =lim(x→-∞){[(x^2-x+1)-x^2]/[√(x^2-x+1)-x]} =lim(x→-∞){(-x+1)/[√(x^2-x+1)-x]} =-lim(x→-∞){(-1+1/x)/√[1-1/x+1/x^2)+1]} =-(-1+0)/√[1-0+0)+1] =1/2。 ∴y=1/2是给定曲线的水平渐近线,而y=2x-1/2是斜渐近线。
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