请大神帮我做一道高数题,关于曲面积分的

1个回答

P=x/(x^2+y^2+z^2)^(3/2) Q=y/(x^2+y^2+z^2)^(3/2) R=z/(x^2+y^2+z^2)^(3/2)偏P/偏x=1/(x^2+y^2+z^2)^(3/2)-3x^2/(x^2+y^2+z^2)^(5/2)偏Q/偏y=1/(x^2+y^2+z^2)^(3/2)-3y^2/(x^2+y^2+z^2)^(5/2)偏R/偏z=1/(x^2+y^2+z^...