19.
?
1. root
2. polyroot
3. find
4. minner
20.
root?
1.
2.
3.
21.
?
1. root
2. polyroot
Numol
Find
22.
?
1. 1i
2. 1j
3. i*i
4. 1 2
23.
?
Stiffb, Stiffr, Radau
Pdesolve, numol, Rkadapt
Pdesolve, numol
Multigrid, relax
24.
?
Calculator Toolbar
Greek Symbol Toolbar
3. Evaluation Toolbar
4. Graph Toolbar
25.
?
1. Symbolics→Variable→Differentiate
2. Symbolics→Variable→Integrate
3. Symbolics→Evaluate→Symbolically
4. 1,3
5. 1,2,3
26.
?
1. Symbolics→Variable→Integrate
2. Symbolics→Variable→Differentiate
3. Symbolics→Evaluate→Symbolically
4. 2,3
27.
?
Definition () Calculator ()
Definition () Evaluation ()
3. <:>
4.
ELCUT
28.
ELCUT?
1.
29.
?
1. ANSYS
Femlab
Elcut
4.
30.
?
1.
4.
31.
?
1.
3.
4.
32.
?
1.
3.
4.
33.
1. 
2. 
3. 
4. 
34.
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1.
