????????:
??????????????,???????????????????????磺???壬???????????????
??????????????,?????????????????о????
??????????????????????????????????????????????????????????????????о??????????????????????????????????????????????????
??????????
?????????????????
????????????????????????????????????????30??????????????????о?30%,???????100?????100%??????
??????????????
??2???????
1.??????е???????(???????)????90???????????1?????????????????????
??=??????*20
2.?г???90???????
??=??????*20+?????????-90??*50
?????仰?????????????????????
??????????????????
?????????:?佫??????????????????,,???????????????????,???????佫??????????????????,????,???????????????
??????????????????佫???,????????????????:????:??????????????
???????????????????????1???佫????????
????????????佫35????????43,?????:86????45????????:43+86+45=174
???,??1???????????:174-???=139(???????????)
1????????139*(43/174)=34
1????????139*(86/174)=69
1????????139*(45/174)=36
???????????1??????????????????????34,?????:69????36
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