Question

设二元函数f(x,y)在点(0,0)的某个领域内有定义，且当x≠0时，f(x,0)-f(0,0)/z=3x+2,则f'(0,0)=__(如图下？

求详细解说该题

Answer 1

2,
由偏导数定义
limf(x,0)-f(0,0)/x x趋向0
=fx(0,0)
所以fx(0,0)=3x+2|x=0 =2

追答

望采纳～