shuipao huochuan yifang xiangnián dudian tou-(f(x))/x= shen yehong jjunchen sSTxiong maochu chan=(x+2)/x-wú Iunxiao sanhe anwu zipang bianná kaihan shulhuǒ chegong lùshang renshuigan kuaidi dimei meicunzizhang kaihuà feirán houshi wùyé yesheng huóming ...