???????????????????????????????????????????????蹲????????????????
?????????????
?????????????Я?????1~4??????????????????-?????????????????????ɡ?????????1~4??????1~4??????????????1??????????2???????????3??????4???4??????
1?????????????????????Щ????????
1)??????????
????????????????費(fèi)???????????????????=????????????+???????????????1??+2??=3????2??+3??=5????1??+2??+3??+4??=10????………
???磺?????4????????????????????????????????2???????????????????????????????????????????????????????????????????????????????2?????????????????????????????????????軔???4+2=6??????????
2)???????????????
?????????????????????????????????????????;????1??+1??=1??;2??+2??=2??;3??+3??=3??;4??+4??=4??;
?????????1??????????????????????1???????????????????????????????????????????????????????軹??????1??????????????
3)???1-10????????
1???????????Я??1????;
2???????????Я??2????;
3???????????Я??3????????1??+2???????????????????;
4???????????Я??3????????1??+3???????????????????;
5??????1??+4??????????????????????2??+3?? ?????????????????;
6??????2??+4??????????????????????1??+2??+3?? ?????????????????;
7??????1??+2??+4?? ?????????????????;
8??????1??+3??+4?? ?????????????????;
9??????2??+3??+4?? ?????????????????;
10??????1??+2??+3??+4???????????????????;
2????????????????????????????
1)??????????δ????????????????????????????????軔???????????
2)???????????????????????????????????????????Щ???????????????????С???????????????????????????????????
????????????????
??????5?????????и????????????(??????????????)?????????????????(??????????????????滻;????????????????????滻);
???磺?????3??????????????????????????????????????????????
???????????????????滻???????????????????????!