lim(x趋于无穷大)(x^2+1/x+1 -ax-b)=0求a b
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解决时间 2021-02-20 20:06
- 提问者网友:战皆罪
- 2021-02-20 02:34
lim(x趋于无穷大)(x^2+1/x+1 -ax-b)=0求a b
最佳答案
- 五星知识达人网友:执傲
- 2021-02-20 03:35
∵ lim(x->∞)(x^2+1)/(x+1) -ax-b = 0∴ 0=lim(x->∞)[(x^2+1)/(x+1) -ax-b ] / x =lim(x->∞)[(x+1/x)/(x+1) -a-b/x=lim(x->∞)[(1+1/x^2)/(1+1/x) -a-b/x= 1 - a - 0 = 1-a∴ a = 1∴lim(x->∞)(x^2+1)/(x+1) - x - b =lim(x->∞)(x^2+1 - x^2 - x )/(x+1) - b =lim(x->∞)(1 - x )/(x+1) - b =lim(x->∞)(1/x - 1 )/(1+1/x) - b = -1 - b= 0∴ b = -1
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- 1楼网友:低血压的长颈鹿
- 2021-02-20 03:47
我好好复习下
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