微分問題 U=C*r dC/dr =? d^2C/d^2r =?

2016-11-20 8:12 am

回答 (1)

2016-11-20 9:46 am
微分問題 U=C*r dC/dr =? d^2C/dr^2 =?
Sol
U=Cr
C=U/r
dC/dr
=d(U/r)/dr
=Ud(1/r)dDr
=-U/r^2
d^2C/dr^2
=-Ud(1/r^2)/dr
=2U/r^3


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