????:1???????:???????

2?????????

3???????????

4???????

5??????????

??2??15??????????? ?????????????,?????15???,??????6.4?????????????????????,??????????

??,????????????15??????????????4???48???????????????????,???-??????(?????49.92????????????,??88.28??????????????)?6.4????????????,??

????,????????????????????????,???????????,?,????

????????????????????,????,?????????????? ?????:??