. :
) ,
) ,
) () .
.
) . . , . , , 1, , , 2. , 1 2, , , . .
.
1. = , = b = b .
. . ∆ , , (. 1). . -, [ ) ( Î[ )), .. = b). -, b, .. S b ( Î S (, b)).
: , [ ) S (, b). .
. , b b (. 2). :
1) [ ] = ;
2) [ ] Ð = b;
3) S b;
4) [ ) S, (. 3).
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. B : [ ] = , [ AC ] = b = b. , A .
. .
1) ;
2) ABC [ );
3) ;
4) , ( ), , ( ), , .
) , - (, , ..) .
, , : , ..
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, , . . .
.
2. .
. . D ,
[ ] = , [ D ] = b, [ ] = , [ D ] = d (. 4). , . [ D ] [ D' ]. D ' , d, b (b > ). [ D' ] [ DD' ] = . , (D) [ ] = . D. D . .
. : , b, , d, , b (b > ), , d (. 5).
b
a
c
d
. 5 . 6
:
1) ∆ D ¢ c, d, b ;
2) [ D ¢] (), C, D ¢ D.
D (. 6).
. D: [ ] || [ D ], , D , [ ] = , [ D ] = b, ([ D ] = b + ), [ ] = , [ D ¢] = [ D ]= d.
. ,
d < b < c + d ( ). . d < b < c + d , .
) () , , = f (, b,..., ), , b,..., . . ( ). . .
(I-IV).
I. x = , n Î N, .
II. = , .
. () .
III. = ( ) . , , , .
x : + b, . , + b. , b, .
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(. 7).
1) [ ] = [ ]= b , ,
[ ]+ [ ]= + b.
2) [ ]. .
3) [ O ].
4) [ ] .
5) D, D ¢ . x = [ D ]. ([ D ¢] = [ D ]).
IV. = , = > b .