9. Solve the Dirichlet problem in polar coordinates: 
, 1≤r≤2, 0≤θ≤
,wih u(r,0) =0, 
=0, u(1,θ) =0,u(2,θ)=10.
阿摩線上測驗
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9. Solve the Dirichlet problem in polar coordinates: , 1≤r≤2, 0≤θ≤,wih u(r,0) =0, =0, u(1,θ) =0,u(2,θ)=10.