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设z=f(x2-y2​,exy),其中f(ξ,η)有连续的二阶偏导数,求,.

设z=f(x2-y2,exy),其中f(ξ,η)有连续的二阶偏导数,求设z=f(x2-y2​,exy),其中f(ξ,η)有连续的二阶偏导数,求,.设z=f(x2-y2,e

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