<p>文献来源：</p><p>Ramsey F.P.,1927,A contribution to the theory of taxation,Economic Journal,37,4-61</p>

急！急！急啊！跪求解答！

<p><span lang="EN-US" style="; FONT-FAMILY: &quot;Times New Roman&quot;; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-; mso-font-kerning: 1.0pt; mso-bidi-language: AR-SA;">du=dR=0</span></p><p><span lang="EN-US" style="; FONT-FAMILY: &quot;Times New Roman&quot;; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-; mso-font-kerning: 1.0pt; mso-bidi-language: AR-SA;">将du和dR的表达式代入，两边同时除以dx(r)（注(r)表示下标），就可以得到（3）式。</span></p><p><span lang="EN-US" style="; FONT-FAMILY: &quot;Times New Roman&quot;; mso-fareast-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-; mso-font-kerning: 1.0pt; mso-bidi-language: AR-SA;">这里无法显示公式，如果你有需要，我可以把推导发给你</span></p>

<p>非常感谢4楼的回复，并且愿闻其详，请将推导过程发给我。我的E-mail是<a href="mailto:xyzhou82@126.com">xyzhou82@126.com</a></p><p>再次感谢！！！</p>

[此贴子已经被作者于2007-11-29 0:19:01编辑过]

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