....................................................................................................................4
1. ̠ .....................................................................................................6
1.1. ..........................................6
1.2. ............6
2. .....................................................................11
3. MATHCAD..................................21
3.1. ...................................................................................................21
3.2. .......................................................................................22
3.3. ...................................................................................22
3.4. ..................23
4. MATHCAD.......................................................................................25
................................................................................................27

............................28