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[数论] 一个整数对求解问题

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等待hxh posted 2014-12-29 08:30 |Read mode
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realnumber posted 2014-12-29 10:57
b=1,无解
b=2,a=3符合
$b\ge3$,时
\[a^{a-1}(a-b^{b-1})=b^b+a+b\]
可得$a>b^{b-1}\ge 9$,此时上式左边大于$a^9$,右边小于$a^2+2a$
显然有$a^9>a^2+2a$,矛盾。即原方程无解。

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爪机专用 posted 2014-12-29 12:24

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