一道偏导数题.高数.
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/09 03:32:34
![一道偏导数题.高数.](/uploads/image/z/2798461-37-1.jpg?t=%E4%B8%80%E9%81%93%E5%81%8F%E5%AF%BC%E6%95%B0%E9%A2%98.%E9%AB%98%E6%95%B0.)
xQAO0+ĭml\_4ڲ)lad'ѓ&kȿL
{{yW7m^|x;/F|pYljiÍ:R+GgDr)^9} ZFaK20 +ІbPAbO@^7M 0}`D9@r&rca$1(%4UQVYbd-&ȹ)-#ML!b,jc >WߎW֎Zc:L˵r'+kbP
`o_`
一道偏导数题.高数.
一道偏导数题.高数.
一道偏导数题.高数.
lnf=(x-y)ln(x+y)
两边对y求导
f'y/f= -ln(x+y)+(x-y)/(x+y)=[(x-y)-(x+y)ln(x+y)]/(x+y)
所以f'y=f(x,y)*[(x-y)-(x+y)ln(x+y)]/(x+y)=[(x+y)^(x-y-1)]*[(x-y)-(x+y)ln(x+y)]