????????YX?????????????
(??????????+??????)*???????+YX??(???+?﹥)=???????
???????
????:
????ι??????:
YX???????77????????,????????????:3974,3986,3987.?????3980
????ι??????:
YX????????84????????,????????????:4253,4253
????ó?????????????????273.???????????????????.
273/7=39 ?????????????39
?????????? 39*84=3276 ??????????4253-3276=977
???????????????284-284,????682-703
??977-284=693=(682+703)/2=692.5
???????????????10??28.6 ????????????39-28.6=10.4
????????????????????????????????????????40407???????40407????????
