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Problem proposed by Armenia/Australia for the 35th international mathematical olympiad (held in Hong Kong, July 12–19, 1994). $ABC$ is an isoscelestri... 阅读全文
posted @ 2012-10-28 21:58
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(L.Euler 1770,Vollst.Anleitung zur Algebra ,St.Petersburg,OperaOmnia,vol.I).Consider an equation of degree four with symmetric coefficients,e.g., \b... 阅读全文
posted @ 2012-10-28 13:48
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(L.Euler 1770,Vollst.Anleitung zur Algebra ,St.Petersburg,OperaOmnia,vol.I).Consider an equation of degree four with symmetric coefficients,e.g., \b... 阅读全文
posted @ 2012-10-28 13:48
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Solve: \begin{equation} \label{eq:27.21.23} x^4+Bx^2+Cx+D=(x^2+ux+\alpha)(x^2-ux+\beta) \end{equation} So \begin{equation} \label{eq:27.21... 阅读全文
posted @ 2012-10-28 02:38
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Solve: \begin{equation} \label{eq:27.21.23} x^4+Bx^2+Cx+D=(x^2+ux+\alpha)(x^2-ux+\beta) \end{equation} So \begin{equation} \label{eq:27.21... 阅读全文
posted @ 2012-10-28 02:38
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