????????
????????10???
?÷?????????????1???????15???·???
??Ч??????С?????
?????????????
??????????30???????15???????3?????????????
?÷????????3ζ????????????????????????????????????????????1????????3-5??
??Ч????????????С????????
?????????????
???????50?????????25???????15????????20???
?÷???????4ζ???????????????????????????1??????2?η???
??Ч????????????????????С?????????????????
???????????
???????9????????12???
?÷???????2ζ????????????????????????
??Ч???????????й?????????С???????????????鷢?????????