dz=d[ln(1+x+y)]
=d(1+x+y)/(1+x+y)
=(dx+dy)/(1+x+y).
函數(shù)z=In(1+x+y),求dz
函數(shù)z=In(1+x+y),求dz
數(shù)學(xué)人氣：280 ℃時(shí)間：2020-05-14 09:52:10
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