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?????168(30??)

4????*37=148??? ??????30*8=240??? ??????148+240=388???

?′??388??168????220???

?????398(30??)

4????4*52=208??? ??????30*16=480??? ??????480+208=688???

?′??688??398????290???

??????1280(30??)

4????4*78=312 ??? ??????30*24=720??? ??????720+312=1032???

?′??1032??1280???? ??248

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6С???????Σ????????3?????(??????????3??=9??)

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????????????????1~1999???????2???????2000~2499??????4???????2500?????6?????

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???????:??????6?????????????(????)??????(????????????????)

??????????????????????5??????????????????????10??20???

30??*(???5???????????????10?????)60=60???(????????)

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????￡?1*10=10??

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4????208(?????????)+4????496(??????????)+30??*16(??????)+70*30(???????8??)+??????è(9*30)+18(6?????????)+???????60+?????????(????)10=3642???

????д????????3642??????????????濴????(??Щ????????????д????????)

(1)QQ????????????20%

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(2)??????

?????????????????????棬????????δ?????15??(С??1000???)????????и???????????25???????п??????????????????????????????

(3)????????

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