():
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3.21 ( 1)
: ; .
: -1002, , .
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1. , . .
1:1
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2. (1) , :
1 = ∆1=
2 = ∆2=
3 = ∆3=
4 = ∆4=
5 = ∆5=
<>=
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ε =
1. , ⅅ
2. :
3. .. . ..
4. . .. . .
5. ., 充. . ..
6. .. :
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3-21 ( 2)
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3.21( 2)
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,
:
(1)
____.;
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