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[函数] 估算数值

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v6mm131 posted 2015-10-19 09:31 |Read mode
已知$2.449<\sqrt{6}<2.450$,估算$ln\frac{3}{2}$的近似值,精确到(0.001)

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abababa posted 2015-10-19 10:41
回复 1# v6mm131

没用到所给的提示,但是用泰勒级数觉得挺方便的
$\ln\frac32=\ln\frac{1+1/5}{1-1/5}=2(x+\frac{x^3}{3})+0x^4+o(x^5)=0.4053=0.405,x=\frac15$
这里$x^5$就在精确度之外了。

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色k posted 2015-10-19 14:19
这么像14年高考题

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xielin7000 posted 2015-10-21 13:12
如果估计$sin2$, $e^2$, ...要求精确到0.001?

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