z=f(x^2+y^2,xy),f(u,v)有连续二阶偏导,求a^2z/ax^2,a^2z/axaz
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z=f(x^2+y^2,xy),f(u,v)有连续二阶偏导,求a^2z/ax^2,a^2z/axaz
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![z=f(x^2+y^2,xy),f(u,v)有连续二阶偏导,求a^2z/ax^2,a^2z/axaz](/uploads/image/z/16001780-68-0.jpg?t=z%3Df%28x%5E2%2By%5E2%2Cxy%29%2Cf%28u%2Cv%29%E6%9C%89%E8%BF%9E%E7%BB%AD%E4%BA%8C%E9%98%B6%E5%81%8F%E5%AF%BC%2C%E6%B1%82a%5E2z%2Fax%5E2%2Ca%5E2z%2Faxaz)
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