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\circlestitle{ç›¸ĺŠ&nbsp;ĺąłĺť‡ă¨ç›¸äą—ĺąłĺť‡ă®é–˘äż‚}

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\noindent
\begin{ascolorbox9}{ç›¸ĺŠ&nbsp;ĺąłĺť‡ă¨ç›¸äą—ĺąłĺť‡ă®é–˘äż‚}
\ç›¸ĺŠ&nbsp;ç›¸äą—ĺąłĺť‡{ĺ…¬ĺĽŹ}[b]
\ç›¸ĺŠ&nbsp;ç›¸äą—ĺąłĺť‡{č¨ĽćŽ}
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\begin{çµ„ă‚«ă©ăĽăśăă‚Żă‚ą}{ĺ‰Ťćśźç¬¬16ĺ›ž\quad äľ‹éˇŚ21}{ç›¸ĺŠ&nbsp;ĺąłĺť‡ă»ç›¸äą—ĺąłĺť‡ă®é–˘äż‚\ajKakko1}
ć¬ˇă®ĺ€¤ă‚’ć±‚ă‚ă‚ă€‚
\begin{kakkoenu}
\item $x&gt;-1$ă®ă¨ăŤďĽŚ$2x+\bunsuu1{x+1}$ă®ćś€ĺ°Źĺ€¤
\item $x&gt;0$ă®ă¨ăŤďĽŚ$\left(x+\bunsuu1x\right)\left(x+\bunsuu4x\right)$ă®ćś€ĺ°Źĺ€¤
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\end{çµ„ă‚«ă©ăĽăśăă‚Żă‚ą}

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\hfill{ďĽç›®ć¨™ć™‚é–“ďĽš5ĺ†ďĽ‰}
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ă€Ś$&gt;0$ă€Ťă¨ă€Śç›¸ĺŠ&nbsp;ĺąłĺť‡ă¨ç›¸äą—ĺąłĺť‡ă®é–˘äż‚ă€Ťă®č¨čż°ăŻĺżă‚Śăšă«ďĽ
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ă©ă‚“ăŞćś€ĺ¤§ă»ćś€ĺ°Źĺ•ŹéˇŚă«ăŠă„ă¦ă‚‚ďĽŚćś‰ĺŤä¸Ťç­‰ĺĽŹăŻç¬¬ä¸€é¸ćŠžč‚˘ă«ćŚ™ă’ăźă„ă¨ă“ă‚Ťă§ă™ă€‚ă—ă‹ă—ďĽŚăźă&nbsp;é©ĺżśă™ă‚‹ă&nbsp;ă‘ă§ăŻăŞăŹďĽŚä¸€ĺ·Ąĺ¤«ĺż…č¦ăŞă‚‚ă®ă‚‚ăźăŹă•ă‚“ă‚ă‚Šăľă™ă€‚ăťă‚Śă‚’ăťă‚Śăžă‚Śč¦‹ă¦ă„ăŤăľă—ă‚‡ă†ă€‚

\begin{maruenu}
\item ăťă®ăľăľé©ç”¨ă™ă‚‹ă¨$2\sqrt{\bunsuu{2x}{x+1}}$ă¨ăŞă‚ŠďĽŚăŞă«ă‚‚ă†ăľăŹă„ăŤăľă›ă‚“ă€‚ăťă“ă§ĺ†ćŻŤăŚ$x+1$ă§ă‚ă‚‹ă“ă¨ă«ćł¨ç›®ă—ďĽŚăťă‚Śă¨ç›¸ć®şă§ăŤă‚‹ă‚ă†ă«$2x$ă®é¨ĺ†ă‚’$2x+2-2$ă¨ă™ă‚‹ă¨ă†ăľăŹă„ăŹă§ă—ă‚‡ă†ă€‚
\item ć™®é€šă«ćŽ›ă‘ç®—ă‚’ă—ăźĺľŚă«é©ç”¨ă™ă‚‹ĺ†ă«ăŻĺ•ŹéˇŚă‚ă‚Šăľă›ă‚“ăŚďĽŚ$\left(x+\bunsuu1x\right),\,\left(x+\bunsuu4x\right)$ăťă‚Śăžă‚Śă«ă¤ă„ă¦ĺ€‹ĺĄă«é©ç”¨ă—ďĽ$2\times4$ă¨ă—ă¦ă—ăľă†ă“ă¨ďĽ‰ďĽŚăťă‚Śă‚’ă‹ă‘ă¦ă—ăľă†ă¨ĺ¤§ĺ•ŹéˇŚă§ă™ă€‚ăŞăśăŞă‚‰ăťă‚Śăžă‚Śă«ăŠă„ă¦ç­‰ĺŹ·ăŚćç«‹ă™ă‚‹ćťˇä»¶ăŚé•ă†ă‹ă‚‰ă§ă™ă€‚ďĽĺ‰Ťč€…ăŻ$x=1$,\,ĺľŚč€…ăŻ4$x=2$ďĽ‰ăťă®ăźă‚ďĽŚç›¸ĺŠ&nbsp;ĺąłĺť‡ă»ç›¸äą—ĺąłĺť‡ă®é–˘äż‚ăŻćś€ĺľŚă«ăľă¨ă‚ă¦ç”¨ă„ă‚‹ă“ă¨ďĽŚăťă—ă¦ç”¨ă„ăźç›´ĺľŚăŻĺż…ăšç­‰ĺŹ·ćç«‹ćťˇä»¶ă‚’ç˘şčŞŤă™ă‚‹ă“ă¨ă‚’ĺżăŚă‘ă¦ăŹă&nbsp;ă•ă„ă€‚
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ä»Ąĺ‰Ťă«č¨ĽćŽă—ăź
\[x^3+y^3+z^3-3xyz\leqq0\]
ăŚĺ†ă‹ă‚Śă°ďĽŚç›¸ĺŠ&nbsp;ç›¸äą—ĺąłĺť‡ă‚’3ć–‡ĺ­—ă«ć‹ˇĺĽµă—ăźé–˘äż‚ĺĽŹă®č¨ĽćŽă‚‚ă§ăŤă‚‹ă®ă§ďĽŚĺ®żéˇŚăŚçµ‚ă‚ŹăŁă¦ăŞăŠä˝™ĺŠ›ă®ă‚ă‚‹äşşăŻč©¦ă—ă¦ăżă‚ă†ďĽ
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\url{https://mmsankosho.com/3kousoukasoujounoshoumeinoyarikata/}
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\mbox{\UTF{27A1}}\ignorespaces\quad ĺ°†ćťĄçš„ă«ăŻ$n$ĺ€‹ă«ć‹ˇĺĽµă—ăźč¨ĽćŽă‚‚ă‚„ă‚Šăľă™ă€‚\vspace{.5\zw}

\vfill{\hfill{ďĽĺ•ŹéˇŚé›†\ p.35ă€śp.38ďĽ‰}}


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