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[函数] 余式求原多项式

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tommywong Posted 2015-3-12 12:35 |Read mode
设$f(x)$和$g(x)$皆为实系数二次多项式且首项系数都是1,已知$f^2(x)$ 除以 $g(x)$的余式 为$4x-4$,而$g^2(x)$ 除以 $f(x)$ 的余式为$-4x-4$,求$f(x)+g(x)$。
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kuing Posted 2015-3-12 14:41
$f^2(x)$ 是表示 $f(x)\cdot f(x)$ 还是 $f(f(x))$?

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Tesla35 Posted 2015-3-25 22:02
回复 2# kuing

迭代指数一般要加括号吧

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kuing Posted 2015-3-26 00:13
回复 3# Tesla35

加什么括号?写来看看……

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Tesla35 Posted 2015-3-26 21:57
回复 4# kuing


    $f^{(n)}(x),f^{(3)}(x)$

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爪机专用 Posted 2015-3-26 22:06
回复 5# Tesla35

这不是导数吗?

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Tesla35 Posted 2015-3-29 16:32
回复 6# 爪机专用
恩所以要说明符号作用。

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abababa Posted 2015-4-4 16:26
发一位网友的解答,还是把$^2$看成平方了
TM截图20150404162302.png
最后的结果是$g(x)=x^2-x+1,f(x)=x^2+x+1,f(x)+g(x)=2x^2+2$

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