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90-????+/-???*2??С??????С?????????????????1?????9??2P??10??19??????????????1P??λ???????????????90-9=81???????????????з????????????????+??????
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90-????*2+/-??????????????С??????С???????20???????????????Pλ????磨?????м????λ????????????90-10=80?? ?????? 0.5P??????6.0??????1P??6.2?????????????
??????30?????
1.????30?????????????????0.5P3.2??????????????λ????3.6?? ???????λ????4????1P??4.7???????+?? ???-???? 2?????????????????+0.3???????-0.4?? ????30?????????????????????
2.???????30?? ???????×2??×3???????????????????????????????????????????????????????????檔
?????????
?????????????λ??1P???????????????????6??λ??????????6?????????????????????????????????1P??????9+????/2????1.5P??λ??9+4/2=11??????????????з????????????????????????????????
??????3.6??С??
??????6??????????????????90-????*2.5+/-??*2????3.6???????????36????
?????????1/4С??
90-????+/-??*2????????40??1p????????4.3??????????????????
?????????70??
???2.0??????2??2.0??????2.5?????-1?? ??3????2.5???-2????С??7???￡?2???1.0????????2??1.8????????3??2.0??????P?????4???3??????4????????????2??????????????????????????飩??
????????????????????????????????????????40407???????40407????????
