??????2?????????????
?????3?£??????????????????????????????????????λ?3?? ?????? ?????? ???????????壬????????μ?????
?????????????
????????????????????????????
???? ???????? ????100 ???20 ????????????? ???? ??????????????????′????????????????120
???? ???????? ????0 ???20 ?????﹥????1???????????1/4????
?????? ???????? ????0 ???15 ?????????????????????????5????????????????????? ???????? ????85 ???15 ????????????з?????????????2??
?????? ???????? ????0 ???15 ?????????????????????????5????????????????
????? ???????? ????85 ???15 ????????????з?????????????2??