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Answers for “为什么 dz 近似于 Δz?”

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To find the total differential of z=x2y2z = x^2y^2, compute the partial derivatives with respect to x and y, then substitute them into the total differential formula. The result is dz=2dz = 2xy^2dx+2x2ydy2 dx + 2x^2y dy.

Conditions: The function is z=x2y2z = x^2y^2.; Standard rules of partial differentiation apply.

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The total differential is used in solving exact differential equations and for approximating the actual change in a function's value, where dz approximates Δz.

Conditions: The context involves differential equations or function approximation.