微分問題 U=C*r dC/dr =? d^2C/d^2r =?
回答 (1)
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
收錄日期: 2021-04-30 21:57:09
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