x方+y方-xy=1 求二阶导数 答案是 6(x方+y方-xy)/x-2y
问题描述:
x方+y方-xy=1 求二阶导数 答案是 6(x方+y方-xy)/x-2y
答
u/ x=Ye^XY,u/ y=xe^XY ^u/ x y=e^XY+xye^XY; ^u/ x^2=y^2e^XY,^u/ y^2=x^2e^XY
x方+y方-xy=1 求二阶导数 答案是 6(x方+y方-xy)/x-2y
u/ x=Ye^XY,u/ y=xe^XY ^u/ x y=e^XY+xye^XY; ^u/ x^2=y^2e^XY,^u/ y^2=x^2e^XY