原文地址:证明不等式--冰火两重天作者:sqing年,博主把三角形中的t-s不等式(1965) 加强为 , 最近,我把自己过去所做的工作介绍到国外,其中就有这个加强不等式. to  that we have following facts: so we need to prove that it is eq ivalent to and in an ac te triangle, we have and (walker s ineq ality). so the ineq ality is tr e. 我的证明:, 同理还有两式,三式相加即得. [硬拼](perfect_radio)已知 是三角形三边长,证明: (kar)证明:原不等式等价于 即 即 即 .