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

2?????????

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

4?????????

5???????

??????1??????????7??? (???????????? ?)????????,?7?15??30??????,???????????21?,???????????????????????????????600???

1??7?,??,????????,?20???,?200????????????????????,???????????300?????10??????????????????????????15??????????????

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??????????????????,????????,??????????????????????????????7?15??30????????,??????????????7??,?21??????????????????,??????????????????????????600?,????116???,??????2??????????????????,????????????????100??

????????,?????????????????,???????????????????????????????300????????????????????????(??????)

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