z = f (x,y) = x3 −xy + y2,求全微分dz。 解 dz = ∂f. ∂x dx +. ∂f. ∂y dy. =(3x. 2 − y) dx +(−x +2y) dy. 例題1.1 differential 的應用是線性逼近,total ...
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