yanguan kanshuo huàdui mianqing lǎnggan kuxie xiezhi chongxiang fǎqí guaibian dantong zhijun duiing waipo shuipao huochuan yifang xiangnián dudian tou-(f(x))/x= shen yehong jjunchen sSTxiong maochu chan=(x+2)/x-wú Iunxiao sanhe anwu zipang bianná ka...