?? ??????:???? ??231.4????????
????:1??????????????:?????????????
2???????
3??????
4???????
5?51?????????
?????????,6?14??20?????????????????15?????8?,????????????????15?????????2??????31??,?????????????????
?142??????,6??14??20?15??8?,????????40?100?????????????,??????,??231.4?????????
?,6?15?10??,???????,??????????????,????????????????4???,???????10?27?,??
?,??,??,??,??
(? ???????????????????? ???????????????????? ? ????)
???:???