, , (.113 ).

, , .

(.153 ).

, , . , .

.

- .

:

 

| | | | | ,|

| | = | | x | | x 2

| | | | | (-|

| | | | | ) |

 

:

 

| ,| | | | |

| -| x | | x 2 = | |

| ( )| | | | |

 

- "" .. 2003 1212 . - 2 . 12 .

"" - 3 . .

:

12 . 3 ./. 2 = 72 .