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# 第三节 复合函数的求导法则 - PowerPoint PPT Presentation

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1、复合函数的中间变量为一元函数的情形

1设

2

2、中间变量不是一元函数而是多元函数的情形

3 的偏导数计算公式 、 中间变量既有一元函数又有多元函数的情形

eusinv

du

eucosv

dv

eusinv

(ydxxdy)

eucosv

(dxdy)

(yeusinveucosv)dx(xeusinveucosv)dy

exy[ysin(xy)cos(xy)]dx

exy[xsin(xy)cos(xy)]dy.

1 链式法则（分三种情况）

2 全微分形式不变性