多元函数微分学求下列函数的偏导数

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(1) u' = y+1/y, u' = x-x/y^2.(2) u' = [1√(x^2+y^2)-x*x/√(x^2+y^2)]/(x^2+y^2) = (x^2+y^2-x^2)/(x^2+y^2)^(3/2) = y^2/(x^2+y^2)^(3/2). u' = -x*y/(x^2+y^2)^(3/2) = -xy/(x^2+y^2)^(3/2).(3) u'...