⑩天掌 Teaching Plan on Advanced Mathematics o 函数的一阶和二阶导数为 Fr x d x y-x dy y-xy 2 =-1. d x' tianjin polytechnic dmivendityTianjin Polytechnic University Teaching Plan on Advanced Mathematics y x F F dx dy = - , y x = - 0, 0 = dx x= dy 2 2 2 y y xy dx d y -  = - 2 y y x y x       - - = - , 1 3 y = - 1. 0 2 2 = - x= dx d y 函数的一阶和二阶导数为