设z=f(x6-y6),f(u)可微,则z/x=____.

设z=f(x6-y6),f(u)可微,则z/x=____.
【正确答案】:6x5f′(x6-y6). 解析: z/x,(x6-y6)•6x5-6xf′(x6-y6).