()^2是平方的意思
第一:x的偏导数:先对x求导,把y看成常数 [1/(1+(y/x)^2]*(-y/x^2)
同样再求y的导数,把x看为常数
[1/(1+(y/x)^2]*(1/x)
第二;y的偏导数:y看为变量,x看为常数 1/(1+(y/x)^2*(1/x)
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