????2???????????????????????????????
???????CASE??A=2??B=1??X=3??
?????????????????????????????ж??е???????????????????????ж??У???????????????????????????????????????????ж??У????????????????????????????漴??棩??
??????1????串?????1/2 (50%)
????????????????ж?????????????T1??F2?????????????????????F????????????X=X/A?????????б???е??????????????????????ж?????????????????T3??T4??????棩????????????T?????????????????X=X+1?????????е?????????????????е?????????????串????λ1/2??
??????2???ж????????2/4 (50%)
???????????????????????串??????????????????ж?????????F???????????ж?????????T???????????????????????????????????4???????ж??????????2/4??
??????3?????????????4/8 ??50%??
??????????ж?????????????T1??F2????????ж?????????????T3??T4????????????е????????????4???????????????????8???????????????????4/8??
??????4???ж????????????6/12 (50%)
????????????????????????ж???????????????????ж????????????????????????????ж??????????????2/4 ???ж????????+ 4/8?????????????=6/12(????????“+”?????????????????????????????????????????????)??
??????5???????????????2/8 (25%)
???????????????????????????????????????????????ж???????????????T1F2????????ж???????????????T3T4????????????е???????????????????????????????????????????????????????????????????????????????????2/8??
??????6??·?????????1/4 (25%)
????????????????????????????·???????????????????????·??????abe?????????·???????????1/4??
????????????
???????????????????????淶??????1??
???????case1??A=2??B=0??X=3;
???????case2:A=1??B=0??X=1??
??????????????????μ?6????????
??????1????串?????2/2 ????
????case1????????ж?????????????T1??T2??????棩????????????T???????????е?X=X/A?????????????????????ж?????????????????T3??T4??????棩????????????T?????????????????X=X+1?????????е????????????????????????е??????????串????λ2/2??
?????????case1???????????????????串????????????????case2???
??????2???ж????????4/4 ()
????case1???????????????串??????????????????ж?????????T???????????ж??????????T?????
????case2????????ж????????????????F1??T2????????????F???????????ж????????????????F3??F4???????????????F?????
???????????????????????????ж??е?4?????????е?????????ж????????4/4()??
??????3?????????????7/8????
????case1????????ж????????????????T1??T2????????ж?????????????????T3??T4??
????case2????????ж????????????????F1??T2????????ж?????????????????F3??F4??
?????????????????????????????F2?????е????????????????????7/8??????
??????4???ж????????????11/12??
?????ж???????????=?ж?????????????????????? = 4/4 + 7/8 = 11/12??
????(5)?????????????4/8 (50%)
????case1????????ж??????????????????T1T2????????ж???????????????????T3T4??
????case2????????ж??????????????????F1T2????????ж???????????????????F3F4??
?????????????????????????????е?????????е??????????????????????????4/8(50%)??
??????6??·?????????2/4??50%??
????case1??????????????????????е???·?????ace??
????case2??????????????????????е???·?????abd??
????????????????е?????·????ace??abd????????????·????abe??acd???????е???????·?????????2/4??50%????