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_____ ______________ 20 .
11
:
|
| : |  0,66
 7,5
| = 10 2 = 10 2 | ||
| 4 = 10 8 4 3 = 10 6 3 | |||
____________________________ 
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.
,
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³ _ _ 
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_____ ______________ 20 .
12
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32´32´4
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s = 160
, (
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F = 0,03 = 3 .
:
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min
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max
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| F | ||||||||||
| min | max | , | fa, | |||||||
| ³, | f max, | , | f min, | |||||||
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_____ ______________ 20 .
13
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___________________________
20 -3 _____
