数学求导数.
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数学求导数.
![](http://img.wesiedu.com/upload/9/d6/9d637d5b91509898ac36bb516ea8af36.jpg)
![](http://img.wesiedu.com/upload/9/d6/9d637d5b91509898ac36bb516ea8af36.jpg)
![数学求导数.](/uploads/image/z/268132-4-2.jpg?t=%E6%95%B0%E5%AD%A6%E6%B1%82%E5%AF%BC%E6%95%B0.)
1,y=x²lnx-x
y'=2xlnx+x²*(1/x)-1
=2xlnx+x-1
2,y=lnx/x²
y'=(1/x*x²-lnx*2x)/(x²)²
=(x-2xlnx)/x^4
=(1-2lnx)/x³
3,y=sin(3x²+1)
y'=cos(3x²+1)×3×2x
=6xcos(3x²+1)
y'=2xlnx+x²*(1/x)-1
=2xlnx+x-1
2,y=lnx/x²
y'=(1/x*x²-lnx*2x)/(x²)²
=(x-2xlnx)/x^4
=(1-2lnx)/x³
3,y=sin(3x²+1)
y'=cos(3x²+1)×3×2x
=6xcos(3x²+1)