????????????洫??????????? ???洫???????????? ???洫???????????????????

???洫????????????????????????????????????

?????λ??600??+1??С?

????9??1800????4.5????1800—600=1200(?)

??????????200+??200x6=1200(?)???????????50÷4.5≈11(??)???????12??50????????????ι?+1??12??+1.2?????????11??(4.5×11=49.5????????1.2????????????!)??

???????????????棬???????????????!

???????????40407???洫???????

?????????40407???洫????audiogearreviews.com/aoqi/???????230417695