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令u=xy v=y z=f(u,v) dz=f1`du+f2`dv du=xdy+ydx dv=dy 代入,有 dz=f1`(xdy+ydx)+f2`dy =y*f1`dx+(x*f1`+f2`)dy 其中的f1`,f2`分別表示對f的第一、第二個參數求偏導數
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