y =-88814529018675082773239/281474976710656*exp(-762910995089705008946046272640625/4835703278458516698824704/(x-16/25)^2*(2184786251229975/1152921504606846976/(x-8/25)^3-5116589636859603/18889465931478580854784/(x-8/25)^9-2507/50000)^2)/(x-16/25)*(2184786251229975/1152921504606846976/(x-8/25)^3-5116589636859603/18889465931478580854784/(x-8/25)^9-2507/50000)*(1/(x-16/25)^2*(2184786251229975/1152921504606846976/(x-8/25)^3-5116589636859603/18889465931478580854784/(x-8/25)^9-2507/50000)-5524168697966075/137438953472/(x-16/25)*(6554358753689925/1152921504606846976/(x-8/25)^4-5756163341467053/2361183241434822606848/(x-8/25)^10))

x 在0~2积

thanks 结果好像是 10^-100 左右

源程序发给我好吗 upchjf@yahoo.com.cn

十分感谢 是值域的问题，已解决