设f(x,y)=x^2*y,则df(1,2)
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设f(x,y)=x^2*y,则df(1,2)
设f(x,y)=x^2*y,则df(1,2)
设f(x,y)=x^2*y,则df(1,2)
全微分公式
df=(偏f/偏x)dx+(偏f/偏y)dy
=(2xy)|(1,2) dx+ (x^2)|(1,2) dy
=2*1*2 dx+ 1^2 dy
=4dx+dy
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